1-Hydroxy-alpha-phenylcyclopentaneacetic acid 1-methyl-4-piperidyl ester 1-Methyl-3-piperidyl(1-hydroxycyclopentyl)phenylacetate 101931-93-5 Cyclopentaneacetic acid, 1-hydroxy-alpha-phenyl-, 1-methyl-4-piperidyl ester