Displaying publications 21 - 40 of 65 in total

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  1. Experimental chemotherapy of lymphatic filariasis. A review
    Mak JW, Navaratnam V, Ramachandran CP
    Ann Trop Med Parasitol, 1991 Feb;85(1):131-7.
    PMID: 1888210
    An intense global collaborative effort under the leadership of the Steering Committee of the Filariasis Scientific Working Group of the Tropical Diseases Research Programme, World Health Organization, has brought together researchers, pharmaceutical chemists and clinicians in the development and search for antifilarial compounds which are more effective and more convenient to administer than diethylcarbamazine citrate, the current drug of choice for lymphatic filariasis. The Brugia spp.-rodent model has been used extensively for the primary screening and B. pahangi infections in the dog or cat for the secondary screening, of potential filaricides. Recently, the leaf-monkey (Presbytis spp.) infected with subperiodic B. malayi or Wuchereria kalimantani has been used for the tertiary evaluation and pharmacokinetic studies of compounds which have shown effectiveness in the primary and secondary screens. Both P. cristata and P. melalophos are extremely susceptible to subperiodic B. malayi infection, but the former is a better host as a higher peak microfilaremia and adult worm recovery rate were obtained. Although more than 30 potential filaricides have been evaluated in the tertiary screen, only a few compounds have shown some promise against lymphatic filariasis. CGP 20376, a 5-methoxyl-6-dithiocarbamic-S-(2-carboxy-ethyl) ester derivative of benzothiazole, had complete adulticidal and microfilaricidal activities against the parasite at a single oral dose of 20 mg kg-1. However, as the compound or its metabolites caused hepatotoxicity, its clinical use in the present formulation is not recommended.(ABSTRACT TRUNCATED AT 250 WORDS)
    Matched MeSH terms: Thiazoles/therapeutic use
  2. Recent advances in the chemotherapy of lymphatic filariasis
    Navaratnam V
    Southeast Asian J Trop Med Public Health, 1993;24 Suppl 2:51-4.
    PMID: 7973948
    Lymphatic filariasis is the most widespread of human filarial infections, a group of vector-borne infestations. After the discovery of diethylcarbamazine (DEC), little advance was made in the development of new chemotherapeutic agents for the treatment of lymphatic filariasis until 1985. Since then, several new initiatives have occurred as the result of a global effort by the World Bank/UNDP/WHO Special Programme on Tropical Diseases and the Onchocerciasis Control Programme. Some of these global research initiatives are reviewed in this paper. Recent observations throw a new light on the rational use of DEC including its deployment as a medicated salt. Ivermectin, an established drug for the treatment of river-blindness is examined for its potential use in the treatment of lymphatic filariasis. Experimental results from two novel compounds out of several being developed by the WHO/OCP Macrofil project are considered in respect to their potential macrofilaricidal activity, particularly in relation to lymphatic filarial infections.
    Matched MeSH terms: Thiazoles/therapeutic use; Benzothiazoles
  3. Fulltext Use of newly available febuxostat in a case of chronic tophaceous gout contraindicated to allopurinol and probenecid
    Abdullah H, Asmahan MI, Rosman A
    Med J Malaysia, 2012 Feb;67(1):125-6.
    PMID: 22582566 MyJurnal
    Urate lowering therapy in this country has mainly been achieved by the use of allopurinol and probenecid. A new xanthine oxidase inhibitor called febuxostat has been approved in 2009 for treatment of hyperuricaemia in gout. In this report, we describe the management of a patient with chronic tophaceous gout using febuxostat. The reduction in serum uric acid to target levels was rapid, and the tophi size had also reduced significantly while on therapy. There was no unwanted side effect observed during the therapy. Therefore, febuxostat would be a useful alternative drug in the treatment of hyperuricaemia in gout patients who have contraindications to allopurinol and probenecid.
    Study site: Rheumatology clinic, Selayang Hospital, Kuala Lumpur, Malaysia
    Matched MeSH terms: Thiazoles/therapeutic use*
  4. Structural insights on Mycobacterium tuberculosis thiazole synthase--a molecular dynamics/docking approach
    Rohini K, Srikumar PS
    Appl Biochem Biotechnol, 2013 Mar;169(6):1790-8.
    PMID: 23340867 DOI: 10.1007/s12010-013-0110-9
    Tuberculosis (TB), an epidemic disease, affects the world with death rate of two million people every year. The bacterium Mycobacterium tuberculosis was found to be a more potent and disease-prolonged bacterium among the world due to multi-drug resistance. Emergence of new drug targets is needed to overcome the bacterial resistance that leads to control epidemic tuberculosis. The pathway thiamine biosynthesis was targeting M. tuberculosis due to its role in intracellular growth of the bacterium. The screening of enzymes involved in thiamin biosynthesis showed novel target thiazole synthase (ThiG) involved in catalysis of rearrangement of 1-deoxy-D-xylulose 5-phosphate (DXP) to produce the thiazole phosphate moiety of thiamine. We carried out homology modeling for ThiG to understand the structure-function relationship, and the model was refined with MD simulations. The results showed that the model predicted with (α + β)8-fold of synthase family proteins. Molecular docking of ThiG model with substrate DXP showed binding mode and key residues ARG46, ASN69, THR41, and LYS96 involved in the catalysis. First-line anti-tuberculosis drugs were docked with ThiG to identify the inhibition. The report showed the anti-tuberculosis drugs interact well with ThiG which may lead to block thiamin biosynthesis pathway.
    Matched MeSH terms: Thiazoles/metabolism*
  5. In vitro cytotoxic evaluation of processed natural coral in human osteoblasts
    Omar NS, Kannan TP, Ismail AR, Abdullah SF, Samsudin AR, Hamid SS
    Int J Toxicol, 2011 Aug;30(4):443-51.
    PMID: 21540334 DOI: 10.1177/1091581811399474
    This study aimed to evaluate the in vitro cytotoxic effects of locally produced processed natural coral (PNC) using human osteoblasts (HOS). Cytotoxicity was not observed when HOS cells were cultured with PNC, as assessed by (3-(4,5-dimethylthiazol-2-yl)-2-5-diphenyl tetrazolium bromide; MTT) and Neutral Red (NR) assays at concentration up 200 mg/mL for up to 72 hours. Flow cytometry (FCM) analysis showed that PNC (200 mg/mL) did not decrease viability of HOS cells after 48 and 72 hours of treatment. In a cell attachment study, the HOS cells attached to the edge of the PNC disc, and later grew into the pores of the PNC disc. All results from these studies indicate that locally produced PNC material is noncytotoxic and favors the growth of HOS cells.
    Matched MeSH terms: Thiazoles/chemistry
  6. Fulltext Electroencephalographic changes associated with antinociceptive actions of lidocaine, ketamine, meloxicam, and morphine administration in minimally anaesthetized dogs
    Kaka U, Hui Cheng C, Meng GY, Fakurazi S, Kaka A, Behan AA, et al.
    Biomed Res Int, 2015;2015:305367.
    PMID: 25695060 DOI: 10.1155/2015/305367
    Effects of ketamine and lidocaine on electroencephalographic (EEG) changes were evaluated in minimally anaesthetized dogs, subjected to electric stimulus. Six dogs were subjected to six treatments in a crossover design with a washout period of one week. Dogs were subjected to intravenous boluses of lidocaine 2 mg/kg, ketamine 3 mg/kg, meloxicam 0.2 mg/kg, morphine 0.2 mg/kg and loading doses of lidocaine 2 mg/kg followed by continuous rate infusion (CRI) of 50 and 100 mcg/kg/min, and ketamine 3 mg/kg followed by CRI of 10 and 50 mcg/kg/min. Electroencephalogram was recorded during electrical stimulation prior to any drug treatment (before treatment) and during electrical stimulation following treatment with the drugs (after treatment) under anaesthesia. Anaesthesia was induced with propofol and maintained with halothane at a stable concentration between 0.85 and 0.95%. Pretreatment median frequency was evidently increased (P < 0.05) for all treatment groups. Lidocaine, ketamine, and morphine depressed the median frequency resulting from the posttreatment stimulation. The depression of median frequency suggested evident antinociceptive effects of these treatments in dogs. It is therefore concluded that lidocaine and ketamine can be used in the analgesic protocol for the postoperative pain management in dogs.
    Matched MeSH terms: Thiazoles/pharmacology*
  7. Fulltext Comparative efficacy and safety of warfarin care bundles and novel oral anticoagulants in patients with atrial fibrillation: a systematic review and network meta-analysis
    Ng SS, Lai NM, Nathisuwan S, Jahan NK, Dilokthornsakul P, Kongpakwattana K, et al.
    Sci Rep, 2020 01 20;10(1):662.
    PMID: 31959803 DOI: 10.1038/s41598-019-57370-2
    Warfarin care bundles (e.g. genotype-guided warfarin dosing, patient's self-testing [PST] or patient's self-management [PSM] and left atrial appendage closure) are based on the concept of combining several interventions to improve anticoagulation care. NOACs are also introduced for stroke prevention in atrial fibrillation (SPAF). However, these interventions have not been compared in head-to-head trials yet. We did a network meta-analysis based on a systematic review of randomized controlled trials comparing anticoagulant interventions for SPAF. Studies comparing these interventions in adults, whether administered alone or as care bundles were included in the analyses. The primary efficacy outcome was stroke and the primary safety outcome was major bleeding. Thirty-seven studies, involving 100,142 patients were assessed. Compared to usual care, PSM significantly reduced the risk of stroke (risk ratio [RR] 0.24, 95% CI 0.08-0.68). For major bleeding, edoxaban 60 mg (0.80, 0.71-0.90), edoxaban 30 mg (0.48, 0.42-0.56), and dabigatran 110 mg (0.81, 0.71-0.94) significantly reduced the risk of major bleeding compared with usual warfarin care. Cluster rank plot incorporating stroke and major bleeding outcomes indicates that some warfarin care bundles perform as well as NOACs. Both interventions are therefore viable options to be considered for SPAF. Additional studies including head-to-head trials and cost-effectiveness evaluation are still warranted.
    Matched MeSH terms: Thiazoles/administration & dosage; Thiazoles/adverse effects
  8. Association of ADRA2A and MTHFR gene polymorphisms with weight loss following antipsychotic switching to aripiprazole or ziprasidone
    Roffeei SN, Reynolds GP, Zainal NZ, Said MA, Hatim A, Aida SA, et al.
    Hum Psychopharmacol, 2014 Jan;29(1):38-45.
    PMID: 24424705 DOI: 10.1002/hup.2366
    Various genetic polymorphisms have been reported to be associated with antipsychotic-induced weight gain. In this study, we aimed to determine whether risk polymorphisms in 12 candidate genes are associated with reduction in body mass index (BMI) of patients following switching of antipsychotics to aripiprazole or ziprasidone.
    Matched MeSH terms: Thiazoles/adverse effects; Thiazoles/therapeutic use*
  9. Mirabegron has longer treatment persistence than antimuscarinics: Real-world data from a Korean national cohort database
    Lee KS, Park H, Kang D, Byun HJ, Foo CY, Hadi FA, et al.
    Neurourol Urodyn, 2021 11;40(8):1972-1980.
    PMID: 34486168 DOI: 10.1002/nau.24776
    AIMS: To descriptively evaluate treatment persistence among adults who received mirabegron or antimuscarinics in South Korea.

    METHODS: This study involved a retrospective analysis of the Health Insurance Review and Assessment (HIRA) database. Patients (≥18 years) who had a new prescription for an overactive bladder (OAB) target medication (mirabegron/antimuscarinic) within an 8-month index period (July 1, 2015-February 29, 2016) were included. The date when the target (index) medication was dispensed was the index date. The 6-month period before the index date was used to assess patient eligibility. A 12-month post-index period was used to assess medication persistence, which was defined as the time to discontinuation. Overall data were analyzed and the results were also stratified by age group (≤65, >65 years), sex, or prior OAB medication experience. Persistence rates were calculated after the 1st, 3rd, 6th, 9th, and 12th months.

    RESULTS: A data set of 52 722 cases was obtained (mirabegron: 11 424, antimuscarinics: 41 298). The mean age was 60.9 ± 16.1 years and the majority of the patients were female (30 862 [58.5%] patients). Median persistence was longer with mirabegron (51 days) versus antimuscarinics (25 days). The persistence rate with mirabegron was higher throughout the study compared with all the antimuscarinics (12-month data: 13.5% and 4.9%, respectively). Longer treatment persistence was noted in older, male, and treatment-experienced patients.

    CONCLUSION: The results from the HIRA database showed that persistence was longer with mirabegron than with antimuscarinics in South Korea. This finding may help inform clinical decision-making within the South Korean healthcare system.

    Matched MeSH terms: Thiazoles
  10. Antitumour benzothiazoles. Part 32: DNA adducts and double strand breaks correlate with activity; synthesis of 5F203 hydrogels for local delivery
    Stone EL, Citossi F, Singh R, Kaur B, Gaskell M, Farmer PB, et al.
    Bioorg Med Chem, 2015 Nov 01;23(21):6891-9.
    PMID: 26474663 DOI: 10.1016/j.bmc.2015.09.052
    Potent, selective antitumour AhR ligands 5F 203 and GW 610 are bioactivated by CYPs 1A1 and 2W1. Herein we reason that DNA adducts' generation resulting in lethal DNA double strand breaks (DSBs) underlies benzothiazoles' activity. Treatment of sensitive carcinoma cell lines with GW 610 generated co-eluting DNA adducts (R(2)>0.7). Time-dependent appearance of γ-H2AX foci revealed subsequent DNA double strand breaks. Propensity for systemic toxicity of benzothiazoles steered development of prodrugs' hydrogels for localised delivery. Clinical applications of targeted therapies include prevention or treatment of recurrent disease after surgical resection of solid tumours. In vitro evaluation of 5F 203 prodrugs' activity demonstrated nanomolar potency against MCF-7 breast and IGROV-1 ovarian carcinoma cell lines.
    Matched MeSH terms: Thiazoles/chemical synthesis; Thiazoles/pharmacology; Thiazoles/chemistry*; Benzothiazoles/chemical synthesis; Benzothiazoles/pharmacology; Benzothiazoles/chemistry
  11. Fulltext Prevention of type 2 diabetes
    Lai LC
    Malays J Pathol, 2002 Dec;24(2):71-6.
    PMID: 12887163
    The prevalence of diabetes is increasing worldwide. The World Health Organisation has estimated that there will be around 300 million diabetics by 2025. The largest increase will occur in Asia. The prevalence of type 2 diabetes is increasing due to a combination of factors: increasing lifespan, sedentary lifestyle, excessive intake of high energy foods, increasing prevalence of overweight/obese people. The Finnish Diabetes Prevention Study Group has clearly shown that changes in the lifestyle of both overweight men and women with impaired glucose tolerance can reduce the incidence of type 2 diabetes by 58%. This finding was confirmed by the Diabetes Prevention Programme which found that lifestyle intervention in individuals with impaired fasting glucose or impaired glucose tolerance reduced the risk of developing type 2 diabetes by 58%, whereas treatment with metformin reduced the risk of type 2 diabetes by only 31%. Both acarbose and troglitazone have also been shown to reduce the progression to diabetes in individuals who are at high risk of developing type 2 diabetes. Since the cure for diabetes remains some way off our concerted efforts should be directed at prevention of diabetes in order to curb the increasing prevalence of diabetes worldwide. Lifestyle changes are more beneficial than long term drug therapy in the prevention of diabetes and should be actively promoted.
    Matched MeSH terms: Thiazoles/therapeutic use
  12. Syntheses of new 3-thiazolyl coumarin derivatives, in vitro α-glucosidase inhibitory activity, and molecular modeling studies
    Salar U, Taha M, Khan KM, Ismail NH, Imran S, Perveen S, et al.
    Eur J Med Chem, 2016 Oct 21;122:196-204.
    PMID: 27371923 DOI: 10.1016/j.ejmech.2016.06.037
    3-Thiazolylcoumarin derivatives 1-14 were synthesized via one-pot two step reactions, and screened for in vitro α-glucosidase inhibitory activity. All compounds showed inhibitory activity in the range of IC50 = 0.12 ± 0.01-16.20 ± 0.23 μM as compared to standard acarbose (IC50 = 38.25 ± 0.12 μM), and also found to be nontoxic. Molecular docking study was carried out in order to establish the structure-activity relationship (SAR) which demonstrated that electron rich centers at one and electron withdrawing centers at the other end of the molecules showed strong inhibitory activity. All the synthesized compounds were characterized by spectroscopic techniques such as EI-MS, HREI-MS, (1)H NMR and (13)C NMR. CHN analysis was also performed.
    Matched MeSH terms: Thiazoles/chemistry*
  13. Suppression of BCL-2 synergizes cisplatin sensitivity in nasopharyngeal carcinoma cells
    Low SY, Tan BS, Choo HL, Tiong KH, Khoo AS, Leong CO
    Cancer Lett, 2012 Jan 28;314(2):166-75.
    PMID: 22033244 DOI: 10.1016/j.canlet.2011.09.025
    The efficacy of cisplatin for treating nasopharyngeal carcinoma (NPC) is limited by the dose-related toxicities and the development of resistance to cisplatin. Recent studies have shown that B cell lymphoma-2 (BCL-2) is overexpressed and confers chemoresistance in NPC. Thus, targeted therapy against BCL-2 may enhance the antitumour effects of chemotherapy by sensitizing the tumor cells to undergo apoptosis. This study evaluated the combined effects of BCL-2 inhibition and cisplatin in NPC cells. Our results demonstrate that inhibition of BCL-2 by small-hairpin RNA (shRNA) or the BCL-2 inhibitor YC137, synergizes cisplatin sensitivity in NPC cells that overexpress BCL-2. We also show that YC137 enhance cisplatin-induced apoptosis in HK1 and CNE1 cells through suppression of BCL-2 protein expression, induction of mitochondrial depolarization and activation of caspase 9 and caspase 3/7. These findings suggest that the combination of BCL-2 inhibition and cisplatin represents a promising strategy for treating NPC.
    Matched MeSH terms: Thiazoles/pharmacology*
  14. Oxidative stress in mouse skin following application of contact allergenic 5-chloro-2-methyl-4-isothiazolin-3-one and oxazolone
    Chung LY
    Contact Derm., 2005 Mar;52(3):170-1.
    PMID: 15811043
    Matched MeSH terms: Thiazoles/adverse effects*
  15. A facile stereoselective synthesis of dispiro-indeno pyrrolidine/pyrrolothiazole-thiochroman hybrids and evaluation of their antimycobacterial, anticancer and AchE inhibitory activities
    Bharkavi C, Vivek Kumar S, Ashraf Ali M, Osman H, Muthusubramanian S, Perumal S
    Bioorg Med Chem, 2016 11 15;24(22):5873-5883.
    PMID: 27687968 DOI: 10.1016/j.bmc.2016.09.044
    A facile stereoselective synthesis of novel dispiro indeno pyrrolidine/pyrrolothiazole-thiochroman hybrids has been achieved by 1,3-dipolar cycloaddition of azomethine ylides, generated in situ from ninhydrin and sarcosine/thiaproline, on a series of 3-benzylidenethiochroman-4-ones. The synthesised compounds were screened for their antimycobacterial, anticancer and AchE inhibition activities. Compound 4l (IC50 1.07μM) has been found to exhibit the most potent antimycobacterial activity compared to cycloserine (12 times), pyrimethamine (37 times) and ethambutol (IC50 <1.56μM) and 6l (IC50=2.87μM) is more active than both cycloserine (4 times) and pyrimethamine (12 times). Three compounds, 4a, 6b and 6i, display good anticancer activity against CCRF-CEM cell lines. Compounds 6g and 4g display maximum AchE inhibitory activity with IC50 values of 1.10 and 1.16μmol/L respectively.
    Matched MeSH terms: Thiazoles/pharmacology; Thiazoles/chemistry
  16. Fulltext New Hybrid Hydrazinyl Thiazole Substituted Chromones: As Potential α-Amylase Inhibitors and Radical (DPPH & ABTS) Scavengers
    Salar U, Khan KM, Chigurupati S, Taha M, Wadood A, Vijayabalan S, et al.
    Sci Rep, 2017 12 05;7(1):16980.
    PMID: 29209017 DOI: 10.1038/s41598-017-17261-w
    Current research is based on the identification of novel inhibitors of α-amylase enzyme. For that purpose, new hybrid molecules of hydrazinyl thiazole substituted chromones 5-27 were synthesized by multi-step reaction and fully characterized by various spectroscopic techniques such as EI-MS, HREI-MS, 1H-NMR and 13C-NMR. Stereochemistry of the iminic bond was confirmed by NOESY analysis of a representative molecule. All compounds 5-27 along with their intervening intermediates 1-4, were screened for in vitro α-amylase inhibitory, DPPH and ABTS radical scavenging activities. All compounds showed good inhibition potential in the range of IC50 = 2.186-3.405 µM as compared to standard acarbose having IC50 value of 1.9 ± 0.07 µM. It is worth mentioning that compounds were also demonstrated good DPPH (IC50 = 0.09-2.233 µM) and ABTS (IC50 = 0.584-3.738 µM) radical scavenging activities as compared to standard ascorbic acid having IC50 = 0.33 ± 0.18 µM for DPPH and IC50 = 0.53 ± 0.3 µM for ABTS radical scavenging activities. In addition to that cytotoxicity of the compounds were checked on NIH-3T3 mouse fibroblast cell line and found to be non-toxic. In silico studies were performed to rationalize the binding mode of compounds (ligands) with the active site of α-amylase enzyme.
    Matched MeSH terms: Thiazoles/chemistry
  17. Assessment of in vitro antioxidant, antibacterial and immune activation potentials of aqueous and ethanol extracts of Phyllanthus niruri
    Amin ZA, Abdulla MA, Ali HM, Alshawsh MA, Qadir SW
    J Sci Food Agric, 2012 Jul;92(9):1874-7.
    PMID: 22231455 DOI: 10.1002/jsfa.5554
    Recently much attention has been paid to biologically active plants because of their low production cost and fewer adverse effects compared with chemical drugs. In the present investigation the bioactivity of Phyllanthus niruri ethanol and aqueous extracts was evaluated in vitro.
    Matched MeSH terms: Thiazoles/metabolism; Benzothiazoles
  18. Fulltext Attenuation of influenza virus infectivity with herbal-marine compound (HESA-A): an in vitro study in MDCK cells
    Mehrbod P, Ideris A, Omar AR, Hair-Bejo M, Tan SW, Kheiri MT, et al.
    Virol J, 2012;9:44.
    PMID: 22340010 DOI: 10.1186/1743-422X-9-44
    The influenza virus is still one of the most important respiratory risks affecting humans which require effective treatments. In this case, traditional medications are of interest. HESA-A is an active natural biological compound from herbal-marine origin. Previous studies have reported that the therapeutic properties of HESA-A are able to treat psoriasis vulgaris and cancers. However, no antiviral properties have been reported.
    Matched MeSH terms: Thiazoles/metabolism
  19. Synthesis and antimicrobial properties of some new thiazolyl coumarin derivatives
    Arshad A, Osman H, Bagley MC, Lam CK, Mohamad S, Zahariluddin AS
    Eur J Med Chem, 2011 Sep;46(9):3788-94.
    PMID: 21712145 DOI: 10.1016/j.ejmech.2011.05.044
    Two novel series of hydrazinyl thiazolyl coumarin derivatives have been synthesized and fully characterized by IR, (1)H NMR, (13)C NMR, elemental analysis and mass spectral data. The structures of some compounds were further confirmed by X-ray crystallography. All of these derivatives, 10a-d and 15a-h, were screened in vitro for antimicrobial activity against various bacteria species including Mycobacterium tuberculosis and Candida albicans. The compounds 10c, 10d and 15e exhibited very good activities against all of the tested microbial strains.
    Matched MeSH terms: Thiazoles/chemistry*
  20. Resistance against apoptosis by the cellular prion protein is dependent on its glycosylation status in oral HSC-2 and colon LS 174T cancer cells
    Yap YH, Say YH
    Cancer Lett, 2011 Jul 1;306(1):111-9.
    PMID: 21439722 DOI: 10.1016/j.canlet.2011.02.040
    Most studies have focused on the role of the cellular prion protein (PrP(C)) in neurodegenerative diseases, whereas the function of this ubiquitous protein outside the nervous system remains elusive. Therefore, the anti-apoptotic property of PrP(C) in oral squamous cell carcinoma (HSC-2) and colon adenocarcinoma (LS 174T) was evaluated in this study, by stable shRNA knockdown and overexpression, respectively. PrP(C) confers resistance against oxidative stress-apoptosis as indicated by MTT assay, Annexin V-FITC/PI and DCFH-DA staining, but this property is abolished upon N-glycosylation inhibition by tunicamycin. Our results indicate that the inhibition of glycosylation in cancer cells overexpressing PrP(C) could represent a potential therapeutic target.
    Matched MeSH terms: Thiazoles/pharmacology
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