Theobromine, formerly known as xantheose, is a bitter alkaloid of the cacao plant, with the chemical formula C₇H₈N₄O₂. It is found in chocolate, as well as in a number of other foods, including the leaves of the tea plant, and the kola (or cola) nut. It is classified as a xanthine alkaloid, which also include the similar compounds theophylline and caffeine. The compounds differ in their methylation.