1-Piperidinepropanoic acid, 4-(ethoxycarbonyl)-4-phenyl-, ethyl ester, hydrochloride (9CI) 1-Piperidinepropionic acid, 4-carboxy-4-phenyl-, diethyl ester, hydrochloride 21630-29-5 4-Carboxy-4-phenyl-1-piperidinepropionic acid diethyl ester hydrochloride NIH 8242 UM 625 VUFB2766