(2S)-2-Methyl-butanoic Acid (1S,7S,8S,8aR)-1,2,3,7,8,8a-Hexahydro-7-methyl-3-methylene-8-[2-[(2R,4R)-tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl]ethyl]-1-naphthalenyl Ester; 2-Methyl-butanoic acid [1S-[1α(R*),7β,8β(2S*,4S*),8aβ]]-1,2,3,7,8,8a-Hexahydro-7-methyl-3-methylene-8-[2-(tetrahydro-4-hydroxy-6-oxo-2H-pyran-2-yl)ethyl]-1-naphthalenyl Ester