2-Propenoicacid, 3-phenyl-,4,10-bis(acetyloxy)-5a-[(acetyloxy)methyl]-5-(benzoyloxy)octahydro-9-hydroxy-2,2,9-trimethyl-2H-3,9a-methano-1-benzoxepin-6-ylester, [3R-(3a,4a,5a,5aa,6a,9b,9aa,10R*)]-