(2R,4S,4aS,5S,6S)-5-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl)ethyl)-2,6-dimethyl-2,3,4,4a,5,6-hexahydro-1aH-naphtho[1,8a-b]oxiren-4-yl 2,2-dimethylbutanoate