Synonyms: 4-Piperidinol,1,3-dimethyl-4-phenyl-, propanoate (ester), hydrochloride, (3R,4S)-rel- (9CI);4-Piperidinol, 1,3-dimethyl-4-phenyl-, propanoate (ester), hydrochloride, cis-(?à)-; 4-Piperidinol,1,3-dimethyl-4-phenyl-, propionate (ester), hydrochloride, (?à)- (8CI); (?à)-Alphaprodine hydrochloride; (?à)-a-1,3-Dimethyl-4-phenyl-4-propionoxypiperidinehydrochloride; 4-Piperidinol, 1,3-dimethyl-4-phenyl-, propanoate (ester),hydrochloride, cis-; Alphaprodine hydrochloride; Nisentil; Nisintel; Nu 1196;Prisilidene; Prisilidene hydrochloride; dl-1,3-Dimethyl-4-phenyl-4-piperidinol propionatehydrochloride; dl-Alphaprodine hydrochloride; a-Prodine hydrochloride