| alpha-(1-propynyl)-cyclobutaneglycolic aci 1-methyl-4-piperidyl ester |
| 1-methyl-4-piperidyl cyclobutyl(1-propynyl)glycolate |
| 2-cyclobutyl-2-hydroxy-3-pentynoic aci 1-methyl-4-piperidyl ester |
| alpha-(1-propynyl)-cyclobutaneglycolic aci1-methyl-4-piperidyl ester |
