1-Methyl-4-piperidyl 3,4-dimethoxyphenyl(isopropenyl)glycolate 101710-94-5 3-Butenoic acid, 2-hydroxy-3-methyl-2-(3,4-dimethoxyphenyl)-, 1-methyl-4-piperidyl ester MANDELIC ACID, 3,4-DIMETHOXY-alpha-ISOPROPENYL-, 1-METHYL-4-PIPERIDYL ESTER