An alternative spelling of guaranin; the chemical compound caffeine found naturally in guaraná plant berries.
Variant spelling of guaranin from Portuguese guaraná and the chemical suffix -ine. Both -in and -ine endings were used interchangeably in 19th-century chemical nomenclature.
Scientists used to argue about whether to call it guaranin or guaranine—a reminder that before standardized chemical naming, different countries and chemists had their own spellings!
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