2,2-Diphenyl-2-ethoxyacetic acid (1-methyl-4-piperidyl)methyl ester hydrochloride 2898-70-6 ACETIC ACID, 2,2-DIPHENYL-2-ETHOXY-, (1-METHYL-4-PIPERIDYL)METHYL ESTER, HYDROCH Acetic acid, 2,2-diphenyl-2-ethoxy-, (1-methyl-4-piperidyl)methyl ester, hydrochloride