Tea contains, in addition to caffeine, small amounts of two other methyl xanthines, theobromine and theophylline, 3,7 -dimethy1 and 1,3-dimethy1 xanthine, respectively.

• 茶除了含咖啡因以外，还含有少量的另外两种甲基黄酮嘌呤，即可可碱和茶碱，它们分别是3，7-二甲基黄嘌呤和1，3-二甲基黄嘌呤。