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(3aR,5S,5aS,7S,8aR,8bS)-7-(tert-Butyl-dimethyl-silanyloxy)-5-methoxymethoxy-4,5,5a,6,7,8,8a,8b-octahydro-3aH-as-indacen-3-one
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(2S,3aS,5aR,8aS,8bR)-2-(tert-Butyl-dimethyl-silanyloxy)-6,6-dimethoxy-2,3,3a,5,5a,6,8a,8b-octahydro-1H-as-indacen-4-one
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[(3aR,5S,5aS,7S,8aS,8bS)-7-(tert-Butyl-dimethyl-silanyloxy)-5-methoxymethoxy-1,3a,4,5,5a,6,7,8,8a,8b-decahydro-as-indacen-3-yl]-acetic acid methyl ester
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(5R,5aR,7S,8aS)-7-(tert-Butyl-dimethyl-silanyloxy)-5-hydroxy-1,4,5,5a,6,7,8,8a-octahydro-2H-as-indacen-3-one