CAS 37815-44-4 ((+)-Nortilidine (i.e. d-nortilidine), which is also mostly unscheduled, has potency of ~2× morphine ((+)-nortilidine), and a duration of 4-6 hours.

(1S,2R)-nortilidine is a ethyl 2-(methylamino)-1-phenylcyclohex-3-ene-1-carboxylate that is dextilidine in which one of the methyl groups attached to the nitrogen is replaced by hydrogen. Dextilidine is a prodrug for (1S,2R)-nortilidine, being metabolised to it by the liver. It has a role as a drug metabolite and an opioid analgesic. It is an enantiomer of a (1R,2S)-nortilidine.

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