6a\',8a\'-Dimethyl-8b\'-(2-methyl-1,3-dioxolan-2-yl)-1\',2\',5\',6\',6a\',6b\',7\',8\',8a\',8b\',9a\',10\',10a\',10b\'-tetradecahydrospiro[[1,3]dioxolane-2,4\'-naphtho[2\',1\':4,5]indeno[1,2-b]oxirene]

6a\',8a\'-Dimethyl-8b\'-(2-methyl-1,3-dioxolan-2-yl)-1\',2\',5\',6\',6a\',6b\',7\',8\',8a\',8b\',9a\',10\',10a\',10b\'-tetradecahydrospiro[[1,3]dioxolane-2,4\'-naphtho[2\',1\':4,5]indeno[1,2-b]oxirene]