Octonic acid, 3,7-anhydro-8-deoxy-2-C-(2-(2,3-dimethyloxiranyl)-7,12-dihydro-11-hydroxy-4,7,12-trioxo-10-(2,3,6-trideoxy-4-O-(2,6-dideoxy-3-O-methyl-alpha-D-ribo-hexopyranosyl)-3-(dimethylamino)-3-C-methyl-alpha-L-lyxo-hexopyranosyl)-4H-anthra(1,2-b)p)