Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Isomers da ke da kaddarorin likita daban-daban na yau da kullun; misali, sanya ƙungiyoyin methyl. A cikin xanthines da aka maye gurbin, theobromine, wanda aka samo a cikin cakulan, shine vasodilator tare da wasu tasirin da ke da alaƙa da maganin kafeyin; amma, idan ɗayan rukunin methyl biyu ya koma wani wuri daban a kan tsakiya mai zoben biyu, isomer shine theophylline, wanda ke da tasiri iri-iri, gami da aikin bronchodilation da anti-inflammatory. Wani misali na wannan yana faruwa a cikin magungunan motsa jiki na phenethylamine. Phentermine wani fili ne wanda ba na chiral ba tare da tasiri mai rauni fiye da na amphetamine. Ana amfani da shi azaman magani mai rage ci kuma yana da laushi ko babu kayan motsa jiki. Duk da haka, wani tsari na atomatik ya ba da dextromethamphetamine, wanda ya fi ƙarfin motsawa fiye da amphetamine.  Tambaya: Me ake samu a cikin cakulan da ke da tasirin cakulan?
theobromine