xanthopterin
noun
xan·thop·ter·in
zan-ˈthäp-tə-rən 
: 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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“Xanthopterin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/xanthopterin. Accessed 23 Dec. 2024.
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