A alkaloid compound related to caffeine but with a different molecular structure, occasionally found in trace amounts in coffee and tea plants.
From 'allo-' (different/variant form) combined with 'caffeine,' the well-known stimulant alkaloid. The prefix indicates this is a structural variant of caffeine rather than caffeine itself.
Allocaffeine is so rare and similar to regular caffeine that for decades scientists weren't even sure it really existed—it's like caffeine's mysterious cousin that nobody could quite pin down!
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