67792-55-6;67843-63-4;Tricyclo[4.2.1.0.02,5]non-6-ene-dione, (1.alpha.,2.alpha.,5.alpha.,6.alpha.)-;Tricyclo(4.2.1.0.02,5)non-6-ene-dione, (1alpha,2alpha,5alpha,6alpha)-;Tricyclo(4.2.1.02,5)non-7-ene-3,4-dione, (1alpha,2beta,5beta,6alpha)-;Tricyclo[4.2.1.02,5]non-7-ene-3,4-dione, (1.alpha.,2.beta.,5.beta.,6.alpha.)-;syn-Tricyclo[4.2.1.02,5]non-7-en-3,4-dione;anti-Tricyclo[4.2.1.02,5]non-7-en-3,4-dione, (1.alpha.,2.alpha.,5.alpha.,6.alpha.)-