1943, in the meaning defined above
International Scientific Vocabulary pteroyl, the radical (C13H11N6O)CO + glutamic acid
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“Pteroylglutamic acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pteroylglutamic%20acid. Accessed 26 Oct. 2020.
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