| 2-hydroxy-3-methyl-2-(1-propynyl)-valeric aci 1-methyl-4-piperidyl ester |
| 1-methyl-4-piperidyl sec-butyl(1-propynyl)glycolate a |
| 1-methyl-4-piperidyl sec-butyl(1-propynyl)glycolate b |
| 2-hydroxy-3-methyl-2-(1-propynyl)-pentanoic aci 1-methyl-4-piperidyl este |
| 2-hydroxy-3-methyl-2-(1-propynyl)-valeric aci1-methyl-4-piperidyl ester |
