A variant plural form of caffeine, particularly used in some languages or older English texts; an alternative spelling of caffeines.
A less common English plural form, more common in other languages like French (caféines) and German (Koffeine). This form appears in older pharmaceutical and scientific texts.
Different languages have different ways of making plurals—English usually doesn't pluralize caffeine, but older scientific texts and other languages show how the -s or -es ending gets added differently depending on where and when something was written.
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