1-Cyclopenteneglycolic acid, alpha-(1-propynyl)-, 1-methyl-4-piperidyl ester 1-Methyl-4-piperidyl 1-cyclopentenyl(1-propynyl)glycolate 102571-06-2 3-Pentynoic acid, 2-(1-cyclopentenyl)-2-hydroxy-, 1-methyl-4-piperidyl ester