4-<(Z)-5-(4-hydroxy-4-methyl-2-pentynylidene)-1-cyclopenten-1-yl>2-methyl-3-butyn-2-ol

2-[6,6-Dimethoxy-hex-(Z)-ylidene]-cyclopentanone

(Z)-2-(6,6-dimethoxyhexylidene)cyclopentanol

(Z)-[2-(6,6-dimethoxyhexylidene)cyclopentyloxy]triisopropylsilane