tioguanine

== English == === Alternative forms === thioguanine (US, UK) === Etymology === From thio- +‎ guanine. === Pronunciation === (General American) IPA(key): /ˌtaɪ.oʊˈɡwɑˌnin/ === Noun === tioguanine (uncountable) (pharmacology) A crystalline compound C5H5N5S which is a thio analog of guanine with cytotoxic properties as an antimetabolite, given orally in the treatment of leukemia. === References === “thioguanine”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022. “thioguanine”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.