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n. A bitter, colorless alkaloid, C7H8N4O2, derived from the cacao bean, found in chocolate products and used in medicine as a diuretic, vasodilator, and myocardial stimulant.

n. An alkaloid, of similar structure to caffeine, found in chocolate and cocoa.

n. An alkaloidal ureide, C7H8N4O2, homologous with and resembling caffeine, produced artificially, and also extracted from cacao and chocolate (from Theobroma Cacao) as a bitter white crystalline substance; -- called also dimethyl xanthine.

n. A crystalline alkaloid (C7H8N4O2), forming salts with acids, volatile and very bitter.

"The biggie that most people have heard about is the caffeine relative called theobromine, which is the one usually shown on "I heart chocolate" tee-shirts, so that's a good place to start, with its trippy endorphins to create a pleasant buzz."

dimethyl xanthine   

thea    theophylline    berberine    phenacetin    scopolamine