(3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyl-5-((((3R,4S,5R,6R)-3,4,5-tris(benzyloxy)-6-((benzyloxy)methyl)tetrahydro-2H-pyran-2-yl)oxy)methyl)tetrahydro-3aH-bis[1,3]dioxolo[4,5-b:4',5'-d]pyran