O-Desmethyltramadol, also known as O-DSMT and desmetramadol, is an opioid substance of the phenylpropylamine class. It is an active metabolite of tramadol. O-Desmethyltramadol is loosely analogous to codeine, but is not a morphinan opiate. Instead, it contains two rings including a cyclohexane ring that is bonded to a phenyl ring at R1. O-DSMT Pellets
This phenyl ring is substituted at R3 with a hydroxy group (OH-). An additional hydroxy group is found at the same location the cyclohexane ring is bonded to at the phenyl ring, R1. O-DMST features a third substitution on its cyclohexane ring at R2. Here the ring is bonded to a dimethylamine group connected through a methylene bridge.