1-Methyl-4-piperidyl 2-thienyl(1-propynyl)glycolate 102367-42-0 2-Thiopheneglycolic acid, alpha-(1-propynyl)-, 1-methyl-4-piperidyl ester 3-Pentynoic acid, 2-hydroxy-2-(2-thienyl)-, 1-methyl-4-piperidinyl ester alpha-(1-Propynyl)-2-thiopheneglycolic acid 1-methyl-4-piperidyl ester