(3ar,4R,5R,6as)-hexahydro-4-[(1E,3S,5S)-5-methyl-3-[(tetrahydro-2H-pyran-2-yl)oxy]-1-nonen-1-yl]-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2H-Cyclopenta[b]furan-2-one