1-Methyl-4-phenyl-4-piperidinol propionate (ester) 1-oxide hydrochloride 1-Methyl-4-phenyl-4-propionoxypiperidine N-oxide hydrochloride 13147-08-5 4-Piperidinol, 1-methyl-4-phenyl-, propionate (ester), 1-oxide, hydrochloride 4956-14-3