<unk>  is the major active metabolite of tilidine. It is formed from tilidine by demethylation in the liver. The racemate has opioid analgesic effects roughly equivalent in potency to that of morphine. The (1R,2S) isomer has NMDA antagonist activity. The drug also acts as a dopamine reuptake inhibitor. The reversed-ester of<unk>  is also known, as is the corresponding analogue with the cyclohexene ring replaced by cyclopentane, which have almost identical properties to<unk> .
Nortilidine
Lidocaine
Maprotiline
Ibutilide
Lofexidine
Dofetilide
Sotalol
Colestilan