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(4aR,5aS,10aR,11aS)-9-[(2R,3S,5R,6S)-5-Benzyloxy-6-benzyloxymethyl-3-(4-methoxy-benzyloxy)-tetrahydro-pyran-2-ylmethyl]-2,2-di-tert-butyl-octahydro-1,3,5,8,10-pentaoxa-2-sila-cyclohepta[b]naphthalene
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(2R,4aR,5aS,8R,9S,10aR,11aS)-8-((2R,3S,5R,6S)-5-Benzyloxy-6-benzyloxymethyl-2-vinyl-tetrahydro-pyran-3-yloxy)-2-(4-methoxy-phenyl)-9-vinyl-decahydro-1,3,5,10-tetraoxa-cyclohepta[b]naphthalene