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  • Benzoic acid (2R,3S,4R,5R,6S)-2-benzyloxymethyl-5-(3,4-dimethyl-2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-6-[dimethyl-(1,1,2-trimethyl-propyl)-silanyloxy]-4-(9H-fluoren-9-ylmethoxycarbonyloxy)-tetrahydro-pyran-3-yl ester

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