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(1R,2R,4S)-2-Ethyl-2,5,7-trihydroxy-4-[(2R,4S,5S,6S)-6-methyl-4-[methyl-(2,2,2-trifluoro-acetyl)-amino]-5-(4-nitro-benzoyloxy)-tetrahydro-pyran-2-yloxy]-6,11-dioxo-1,2,3,4,6,11-hexahydro-naphthacene-1-carboxylic acid methyl ester