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  • (4S,4aS,8S,8aS)-4-{(R)-1-Acetoxy-2-[(1R,2S)-2-(tert-butyl-diphenyl-silanyloxymethyl)-1-methyl-5-oxo-cyclopentyl]-ethyl}-8-(tert-butyl-diphenyl-silanyloxy)-2,5-dioxo-octahydro-naphthalene-1,4a-dicarboxylic acid 1-allyl ester 4a-methyl ester

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