2H-3,9a-Methano-1-benzoxepin-4,5,6,7,9,10-hexol,5a-[(acetyloxy)methyl]octahydro-2,2,9-trimethyl-, 4,6,7,10-tetraacetate5-benzoate, (3R,4R,5S,5aS,6R,7S,9S,9aS,10R)-