<unk> , also known as xantheose, is a bitter alkaloid of the cacao plant, and is therefore found in chocolate. It is in the methylxanthine class of chemical compounds, which also includes the similar compounds theophylline and caffeine.  Despite its name, the compound contains no bromine —<unk>  is derived from Theobroma, the name of the genus of the cacao tree, (which itself is made up of the Greek roots theo ("God") and broma ("food"), meaning "food of the gods") with the suffix -ine given to alkaloids and other basic nitrogen-containing compounds.<unk>  is a water insoluble, crystalline, bitter powder; the colour has been listed as either white or colourless. It has a similar, but lesser, effect to caffeine, making it a lesser homologue.<unk>  is an isomer of theophylline as well as paraxanthine.<unk>  is categorized as a dimethyl xanthine, which means it is a xanthine with two methyl groups.<unk>  was first isolated from the seeds of the cacao tree in 1878 and then shortly afterwards was synthesized from xanthine by Hermann Emil Fischer.
Theobromine
Hymecromone
Dihydroergocryptine
Diisopromine
Benzoctamine
Carbocromen
Cromolyn 
Nomifensine