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Theobromine

Theobromine (C7H8N4O2, or 3,7-dimethylxanthine, or 3,7-Dihydro-3,7-dimethyl-1H-purine-2,6-dione) is an alkaloid of the methylxanthine family, which also includes the similar compounds theophylline and caffeine. It is known to induce mutations in bacteria and lower eukaryotes, but does not seem to cause mutations in higher eukaryotes.

Theobromine is found in cocoa and chocolate, in doses that are safe for humans to consume in large quantities, but can be lethal for animals such as dogs and horses, as they metabolize theobromine more slowly.