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A number of studies have been conducted with the related compound known as theophylline .
While caffeine primarily is active in the brain and muscles, theophylline is active in stimulating the respiratory system, heart and kidneys.
Three very similar compounds - all in this same group of alkaloids - are present in common beverages, namely caffeine, theophylline , and theobromine.
It contains not only caffeine but also theophylline , a compound that can ease the symptoms of a cold.
Two related xanthines, theobromine and theophylline , are often present in smaller amounts.
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