2H-3,9a-Methano-1-benzoxepin-4,5,6,7,10-pentol,5a-[(acetyloxy)methyl]octahydro-2,2,9-trimethyl-, 6,7,10-triacetate4,5-dibenzoate, [3R-(3a,4a,5b,5aa,6a,7a,9a,9aa,10R*)]-