a cikin isomer da ke da nau'o'in magani daban-daban na kowa ne; misali, sanyawa na kungiyoyin methyl. A cikin xanthines, theobromine, wanda aka samo a cikin cakulan, yana da vasodilator tare da wasu sakamako na kowa tare da maganin kafeyin; amma, idan daya daga cikin kungiyoyin methyl guda biyu ya motsa zuwa wani wuri daban-daban a kan tsakiya guda biyu, isomer shine theophylline, wanda yana da nau'o'in tasiri, ciki har da bronchodilation da anti-inflammatory aiki. Wani misali na wannan yana faruwa a cikin kwayoyi masu motsa jiki na phenethylamine. Phentermine wani abu ne wanda ba shi da mahimmanci tare da tasiri mai rauni fiye da na amphetamine. Ana amfani dashi azaman magani mai rage ci kuma ba shi da wani abu mai motsawa. Duk da haka, yana ba da wani tsari na atomatik daban-daban na dextromethamphetamine, wanda yake da karfi mai motsawa fiye da amfetamine da aka samo a cikin cakulan. Tambaya: Mene ne amfetamine na yau da kullum?
theobromine