Yellow pterin pigment found in some insect wings.
<chemical> 2-amino-1,5-dihydro-4,6-pteridinedione. Pigment first discovered in butterfly wings and widely distributed in plants and animals. ... Chemical name: 4,6-Pteridinedione, 2-amino-1,5-dihydro- ... (12 Dec 1998) ... Found on http://www.encyclo.co.uk/local/20973
Xanthopterin is a yellow, crystalline solid that occurs mainly in the wings of butterflies and in the urine of mammals. Small microorganisms convert it into folic acid. It is the end product of a non-conjugated pteridine compound and inhibits the growth of lymphocytes produced by concanavalin. High levels of the chemical were found in patients wit...Found on http://en.wikipedia.org/wiki/Xanthopterin
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