33163-94-9;1,4:5,8-Dimethanonaphthalen-2(1H)-one, 3,4,4a,5,8,8a-hexahydro-, (1.alpha.,4.alpha.,4a.beta.,5.beta.,8.beta.,8a.beta.)-;1,4:5,8-Dimethanonaphthalen-2(1H)-one, 3,4,4a,5,8,8a-hexahydro-, (1alpha,4alpha,4abeta,5beta,8beta,8abeta)-