Spiro[3H-benz[e]indene-3,9'-[9H-3,9a]methano[1]benzoxepin]-2',8(2H,3'H)-dione,4,4',5'-tris(acetyloxy)-6'-(benzoyloxy)-1,3a,4,4',5,5',5a,5'a,6',9,9a,9b-dodecahydro-7-methoxy-2,3',5a,5'a,6,8',9b-heptamethyl-,[3'S-[3'a,4'b,5'b,5'aa,6'a,9'b(2R*,3aR*,4S*,5aR*,