(2R,3S)-4-dimethylamino-3-methyl-1,2-diphenyl-2-propionyloxy-butane,hydrochloride, 2-Butanol,4-(dimethylamino)-3-methyl-1,2-diphenyl-,propionate (ester),hydrochloride,(L), Levopropoxyphene HCl, [4-(dimethylamino)-3-methyl-1,2-diphenylbutan-2-yl] propanoate hydrochloride, [4-(dimethylamino)-3-methyl-1,2-diphenylbutan-2-yl] propanoate,hydrochloride, L-Propoxyphene hydrochloride, D-propoxyphene, (2R,3S)-4-Dimethylamino-3-methyl-1,2-diphenyl-2-propionyloxy-butan,Hydrochlorid, Levopropoxyphene hydrochloride