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  • Xanthopterin is a yellow, crystalline solid[1], that occurs mainly in the wings of butterflies and in the urine of mammals[1]. Small microorganisms convert it into folic acid[2]. It is the end product of a non-conjugated pteridine compound[3]. — “Xanthopterin - Wikipedia, the free encyclopedia”,
  • Xanthopterin.svg‎ (SVG file, nominally 250 × 156 pixels, file size: 11 KB) {Information |Description={{de|Struktur von Xanthopterin}}{{en|Structure of Xanthopterine}} |Source={{de|selbst erstellt}}{{en|own work}} |Date. — “File:Xanthopterin.svg - Wikipedia, the free encyclopedia”,
  • This article is within the scope of WikiProject Chemistry, a collaborative effort to improve the coverage of chemistry on Wikipedia. Retrieved from "" Categories: Stub-Class Chemistry articles | Low-importance Chemistry articles | WikiProject Chemistry. — “Talk:Xanthopterin - Wikipedia, the free encyclopedia”,


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