pethidine hydrochloride1-methyl-4-carbethoxy-4-phenylpiperidine hydrochloride1-methyl-4-phenyl-4-carboethoxypiperidine hydrochloride1-methyl-4-phenylisonipecotic acid ethyl ester hydrochloride4-(ethoxycarbonyl)-1-methyl-4-phenylpiperidinium chlorideN-methyl-4-phenyl-4-carbethoxypiperidine hydrochlorideethyl 1-methyl-4-phenylisonipecotate hydrochlorideethyl 1-methyl-4-phenylpiperidyl-4-carboxylate hydrochlorideethyl-1-methyl-4-phenylisonipecotate hydrochlorideisonipecaine hydrochloridemeperidine HClmeperidine hydrochloridepethidine HClpethidine chloridepethidine hydrochloridesauteralgyl