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methyl 11-[(6-deoxy-3-C-methyl-2,3,4-tri-O-methylhexopyranosyl)oxy]-4-(dimethylnitroryl)-3,5,8,10,13-pentahydroxy-6,13-dimethyl-9,16-dioxo-3,4,5,6,9,11,12,13,14,16-decahydro-2H-2,6-epoxytetraceno[1,2-b]oxocine-14-carboxylate