- a white, crystalline, water-insoluble, poisonous powder, C7H8N4O2, an isomer of theophylline and lower homologue of caffeine, occurring in tea and obtained from the cacao bean: used chiefly as a diuretic, myocardial stimulant, and vasodilator.
- a white crystalline slightly water-soluble alkaloid that occurs in many plants, such as tea and cacao: formerly used to treat asthma. Formula: C 7 H 8 N 4 O 2
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