89771-80-2;1,4:5,8-Dimethanophthalazine, 1,4,4a,5,8,8a-hexahydro-10,10-dimethyl- (1alpha,4alpha,4aalpha,5alpha,8alpha,8aalpha)-;1,4:5,8-Dimethanophthalazine, 1,4,4a,5,8,8a-hexahydro-10,10-dimethyl- (1.alpha.,4.alpha.,4a.alpha.,5.alpha.,8.alpha.,8a.alpha.)-