51898-92-1;Tetracyclo[6.1.0.0(2,4).0(5,7)]nonane, 3,3,6,6,9,9-hexamethyl-, cis,cis,trans--;Tetracyclo(6.1.0.02,4.05,7)nonane, 3,3,6,6,9,9-hexamethyl-, (1alpha,2alpha,4alpha,5beta,7beta,8alpha)-;Tetracyclo[6.1.0.0(2,4).0(5,7)]nonane,3,3,6,6,9,9-hexamethyl-(1.alpha.,2.alpha.,4.alpha.,5.beta.,7.beta.,8.alpha.)-