(2R,3S,3aR,4S,6R)-3-(2-((2R,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl)ethyl)-2,6-dimethyl-1a,2,3,3a,4,5,6,7b-octahydronaphtho[1,2-b]oxiren-4-yl 2,2-dimethylbutanoate