(3aR,4R,5R,6aS)-Hexahydro-4-[(E)-(3R)-4-phenoxy-3-[(tetrahydro-2H-pyran-2-yl)oxy]-1-butenyl]-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2H-cyclopenta[b]furan-2-one