(Z)-2-Hydroxy-2-isopropyl-3-pentynoic acid 1-methyl-4-piperidyl ester 1-Methyl-4-piperidyl isopropyl(cis-1-propenyl)glycolate 101931-74-2 3-Pentenoic acid, 2-hydroxy-2-isopropyl-, 1-methyl-4-piperidyl ester (Z)-