1033-93-8 3-Carbethoxy-1-(beta-phenethyl)-4-piperidone hydrochloride 3-Piperidinecarboxylic acid, 4-oxo-1-phenethyl-, hydrochloride EINECS 213-850-4 Ethyl 4-oxo-1-phenethylpiperidine-3-carboxylate hydrochloride NSC 49903