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