(3ar,6ac)-octahydro-pentalene-2c-carboxylic acid
(+/-)-(trans-cyclopentane-1,2-diyl)-di-acetic acid
(+/-)-2-hydroxy-(3ar,6at)-octahydro-pentalene-2-carbonitrile
(+/-)-(3ar,6at)-3,3a,4,5,6,6a-hexahydro-pentalene-2-carbonitrile
(+/-)-trans-hexahydro-pentalen-2-one