1,4-Ethanobenzo(5,6)cycloocta(1,2-c)furan-13-one, 5,9,10,11-tetrakis(acetyloxy)-9a-((benzoyloxy)methyl)tetradecahydro-7,11a-dihydroxy-1,3a-dimethyl-6-methylene-, (1S-(1alpha,3abeta,4alpha,5alpha,5aalpha,7alpha,9beta,9abeta,10alpha,11.bet))