(2R,3S,6R,7S)-6-Benzyloxy-7-benzyloxymethyl-2-((2R,4aR,6S,7R,9aS)-2-phenyl-7-triethylsilanyloxy-hexahydro-1,3,5-trioxa-benzocyclohepten-6-ylmethyl)-oxepan-3-ol