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(3S,3aR,5aS,7R,8aR,8bS)-2-[(2R,3S,7S)-3-(tert-butyldiphenylsiloxy)-7-hydroxy-2-methylnonanoyl]-3,3a,5a,6,7,8,8a,8b-octahydro-7-hydroxy-as-indacene-3-acetic acid κ-lactone pivalate
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2,2-Dimethyl-propionic acid (2R,3aS,5aR,6S,8aS,8bR)-7-[(2R,3S,7S)-7-(tert-butyl-dimethyl-silanyloxy)-3-(tert-butyl-diphenyl-silanyloxy)-2-methyl-nonanoyl]-6-carboxymethyl-1,2,3,3a,5a,6,8a,8b-octahydro-as-indacen-2-yl ester
