This phenyl ring is substituted at R3 with a hydroxy group (OH-). Yet another hydroxy team is found at exactly the same locale the cyclohexane ring is bonded to at the phenyl ring, R1. O-DMST encompasses a third substitution on its cyclohexane ring at R2. Here the ring is bonded to your dimethylamine group related via a methylene bridge.O-Desmethyl