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

(E)-3-[(2R,3S,6R,7S)-6-Benzyloxy-7-benzyloxymethyl-2-(3-oxo-butyl)-oxepan-3-yloxy]-acrylic acid methyl ester