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2,2-Dimethyl-propionic acid (2R,3S,4aR,5S,7R,8aR,9aS,10aR)-5-(tert-butyl-dimethyl-silanyloxy)-7-[2-(tert-butyl-diphenyl-silanyloxymethyl)-allyl]-2-(2,2-dimethyl-propionyloxymethyl)-10a-methyl-decahydro-1,8,10-trioxa-anthracen-3-yl ester
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(2R,3S,4aR,5aS,6aR,8S,9R,10aS,11aR,12aS)-9-Benzyloxy-8-(2-benzyloxy-ethyl)-2-hydroxymethyl-5a,11a-dimethoxy-2-methyl-tetradecahydro-1,5,7,11-tetraoxa-naphthacen-3-ol
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(2R,3S,4aR,5aS,6aR,8S,9R,10aS,11aR,12aS)-9-Benzyloxy-8-(2-benzyloxy-ethyl)-3-(tert-butyl-dimethyl-silanyloxy)-2-(tert-butyl-dimethyl-silanyloxymethyl)-5a,11a-dimethoxy-2-methyl-tetradecahydro-1,5,7,11-tetraoxa-naphthacene