Nexeridine (INN; USAN: nexeridine hydrochloride; code name Compound 673-082) is an opioid analgesic with a similar structure to those of pethidine and tramadol. It was synthesized and assayed in 1975 but was never marketed. The active isomer is (1R,2S)-1-[(2R)-1-(dimethylamino)-2-propanyl]-2-phenylcyclohexyl acetate.