1-Methyl-4-piperidyl-2-thienyl(3-methyl-but-1-yn-3-enyl)glycolate 102367-40-8 2-Thiopheneglycolic acid, alpha-(2-methylbut-1-yn-3-en-1-yl)-, 1-methyl-4-piperidyl ester Hexa-3-yn-5-enoic acid, 2-hydroxy-5-methyl-5-(2-thienyl)-, 1-methyl-4-piperidyl ester alpha-(2-Methylbut-1-yn-3-en-1-yl)-2-thiopheneglycolic acid 1-methyl-4-piperidyl ester