Butanedioic acid, 4'''-ester with 5-((O-2,6-dideoxy-3-O-methyl-alpha-L-lyxo-hexopyranosyl-(1->4)-O-2,3,6-trideoxy-3-C-methyl-3-nitro-beta-L-ribo-hexopyranosyl-(1->4)-2,3,6-trideoxy-3-C-methyl-3-nitro-beta-L-ribo-hexopyranosyl)oxy)-4-(dimethylamino)-3,4,5,6,11,12,13,14-octahydro-3,10,13,15-tetrahydroxy-6,13-dimethyl-11-((2,3,6-trideoxy-3-(dimethylamino)-alpha-L-lyxo-hexopyranosyl)oxy)-2,6-epoxy-2H-naphthaceno(1,2-b)oxocin-9,16-dione