International Scientific Vocabulary pter- (from Greek pteron wing) + -in entry 1; from its being a factor in the pigments of butterfly wings
1934, in the meaning defined above
“Pterin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pterin. Accessed 30 Jan. 2023.
Britannica.com: Encyclopedia article about pterin
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