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