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The Collaborative International Dictionary
Murexan

Murexan \Mu*rex"an\, n. [From Murexide.] (Chem.) A complex nitrogenous substance obtained from murexide, alloxantin, and other ureids, as a white, or yellowish, crystalline which turns red on exposure to the air; -- called also uramil, dialuramide, and formerly purpuric acid.

Wiktionary
murexan

n. (context obsolete chemistry English) A poorly-characterized nitrogenous material formed from several ureids