97806-44-5;97253-51-5;1,4:5,8-Dimethanonaphthalene, 1,4,5,8-tetrahydro-, (1.alpha.,4.alpha.,5.alpha.,8.alpha.)-;1,4:5,8-Dimethanonaphthalene, 1,4,5,8-tetrahydro-, (1alpha,4alpha,5beta,8beta)-;1,4:5,8-Dimethanonaphthalene, 1,4,5,8-tetrahydro-, (1.alpha.,4.alpha.,5.beta.,8.beta.)-;1,4:5,8-Dimethanonaphthalene, 1,4,5,8-tetrahydro-, (1alpha,4alpha,5alpha,8alpha)-