A variant spelling of acetopyrin; possibly referring to acetylsalicylic acid or a related acetylated compound.
Variant spelling using the -ine ending, from acetyl + pyrine, following older pharmaceutical naming conventions.
Like acetomorphine vs. acetomorphin, acetopyrine and acetopyrin show how chemistry nomenclature wasn't standardized in the early 1900s—scientists had multiple ways to spell the same compounds.
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