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(+)-(1S,2R,3S,4R)-3-exo-{(S)-[(tert-butyl)dimethylsilyloxy][(3aR,4aR,7aR,7bS)-3a,4a,7a,7b-tetrahydro-6,6-dimethyl[1,3]dioxolo[4,5]furo[2,3-d]isoxazol-3-yl]methyl}-6-chloro-2-endo-(methoxymethoxy)-7-oxabicyclo[2.2.1]hept-5-ene