73679-39-7;73321-28-5;1,4:5,8-Dimethanonaphthalene, 1,2,3,4,5,6,7,8-octahydro-, (1.alpha.,4.alpha.,5.alpha.,8.alpha)-;1,4:5,8-Dimethano-4a,8a-(methanoxymethano)naphthalene-9,11-dione, octahydro-(1alpha,4alpha,4abeta,5beta,8alpha,8abeta)-;1,4:5,8-Dimethanonaphthalene, 1,2,3,4,5,6,7,8-octahydro-, (1alpha,4alpha,5alpha,8alpha)-;1,4:5,8-Dimethano-4a,8a-(methanoxymethano)naphthalene-9,11-dione, octahydro-(1.alpha.,4.alpha.,4a.beta.,5.beta.,8.alpha.,8a.beta.);1,4:5,8-Dimethanonaphthalene-, 1,2,3,4,5,6,7,8-octahydro-(1.alpha.,4.alpha.,5.beta.,8.beta.)