mercaptopurine
noun
mer·cap·to·pu·rine
(ˌ)mər-ˌkap-tə-ˈpyu̇r-ˌēn
: an antimetabolite C5H4N4S that interferes especially with the metabolism of purine bases and the biosynthesis of nucleic acids and that is sometimes used in the treatment of acute leukemia
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Merriam-Webster unabridged
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