nexeridine nexeridine nexeridine (inn), or as nexeridine hydrochloride (usan) (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--2-phenylcyclohexyl acetate hydrochloride (1:1). not to be confused with meperidine. nexeridineclinical dataatc codenoneidentifiers iupac name 1--2-phenylcyclohexyl acetate cas number53716-48-6 53716-47-5 (hcl)pubchem cid10447719chemspider8623136unii8cm77zq65kchemical and physical dataformulac19h29no2molar mass303.446 g·mol−13d model (jsmol)interactive image smiles cc(cn(c)c)c1(ccccc1c2=cc=cc=c2)oc(=o)c inchi inchi=1s/c19h29no2/c1-15(14-20(3)4)19(22-16(2)21)13-9-8-12-18(19)17-10-6-5-7-11-17/h5-7,10-11,15,18h,8-9,12-14h2,1-4h3key:tvqpxlmqozweba-uhfffaoysa-n