1-Piperidinepropanoic acid, 2,5-dimethyl-4-oxo-, methyl ester, trans- 110998-16-8 N-beta-(2e,5e-Dimethyl-4-oxo-1-piperidyl)propionic acid methyl ester trans-2,5-Dimethyl-4-oxo-1-piperidinepropanoic acid methyl ester