环戊二酸

(+-)-(3ar,6at)-octahydro-pentalene-2-carboxylic acid

rel-(3aR,6aS)-hexahydropentalen-2(1H)-one

(+-)-(3ar,6ac)-3,3a,4,5,6,6a-hexahydro-pentalene-2-carbonitrile

(cis-cyclopentane-1,2-diyl)-di-acetonitrile