1-Methyl-4-piperidyl phenyl(3-methyl-but-1-yne-3-enyl)glycolate 62869-67-4 MANDELIC ACID, alpha-(3-METHYLBUT-1-YN-3-ENYL)-, 1-METHYL-4-PIPERIDYL ESTER alpha-(3-Methylbut-1-yn-3-enyl)mandelic acid 1-methyl-4-piperidyl ester