Isomer-yada leh sifooyinka caafimaad ee kala duwan ayaa caadi ah; tusaale ahaan, meelaynta kooxaha methyl. In xanthines beddelay, theobromine, laga helay shukulaatada, waa vasodilator leh saameyn qaar ka mid ah oo la mid ah kafeyn; laakiin, haddii mid ka mid ah labada kooxood ee methyl loo wareejiyo meel ka duwan oo ku saabsan xudunta laba-ring, isomer waa theophylline, taas oo uu leeyahay noocyo kala duwan oo saameyn ah, oo ay ku jiraan bronchodilation iyo anti-bararka.
theobromine