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The disodium salt of a synthetic pyrimidine-based antifolate. Pemetrexed binds to and inhibits the enzyme thymidylate synthase (TS) which catalyses the methylation of 2\'-deoxyuridine-5\'-monophosphate (dUMP) to 2\'-deoxythymidine-5\'-monophosphate (dTMP), an essential precursor in DNA synthesis. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C1533\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C1533\' NCI Thesaurus)
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