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(2R,3S,6S)-6-{[(1S,4aS,12aR)-3-acetyl-4,4a,6,12a-tetrahydroxy-9-methoxy-11-methyl-2,5,7,10-tetraoxo-1,2,4a,5,7,10,12,12a-octahydrotetracen-1-yl]oxy}-2-methyltetrahydro-2H-pyran-3-yl 2,6-dideoxy-4-O-[( related products: