茶碱

kě kě jiǎn kā fēi yīn chá jiǎn shì huáng piào lìng jiǎ jī yǎn shēng wù

可可碱、咖啡因、茶碱是黄嘌呤甲基衍生物。

The obromine, caffeine and theophylline are zanthine methylium derivates.