xanthopterin

noun
xan·thop·ter·in | \ zan-ˈthäp-tə-rən \

Medical Definition of xanthopterin 

: a yellow crystalline amphoteric pigment C6H5N5O2 that occurs especially in the wings of yellow butterflies and also in the urine of mammals and that is convertible into folic acid by the action of various microorganisms

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