Murexan

• (n.) 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.
Found on http://thinkexist.com/dictionary/meaning/murexan/

Murexan

Mu·rex'an noun [ From Murexide .] (Chemistry) 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 a...
Found on http://www.encyclo.co.uk/webster/M/117
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