1-piperidinecarboxylic acid, 4-oxo-, phenylmethyl ester InChI=1/C13H15NO3/c15-12-6-8-14(9-7-12)13(16)17-10-11-4-2-1-3-5-11/h1-5H,6-10H benzyl 4-oxopiperidine-1-carboxylate