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oxepino<3,2-b>pyrano<2',3':5,6>pyrano<2,3-f>oxepin, 2-<(2,2,2-trimethylacetoxy)methyl>-4,10-bis<(tert-butyldimethylsilyl)oxy>-9-<1-<(tert-butyldimethylsilyl)oxy>propyl>hexadecahydro-5a,10-dimethyl-,<2R-<2α,4α,4aβ,5aβ,7aβ,9α,10β,12aα,13aα,14aα.