[1R-(1alpha,2beta,4beta)]-2-ethyl-1,2,3,4,6,11-hexahydro-2,5,7-trihydroxy-6,11-dioxo-4-[[2,3,6-trideoxy-4-O-[2,6-dideoxy-4-O-[(2R-trans)-tetrahydro-6-methyl-5-oxo-2H-pyran-2-yl]-alpha-L-lyxo-hexopyranosyl]-3-(dimethylamino-alpha-L-lyxo-hexopyranosyl)oxy]-1-naphthacenecarboxylic acid methyl ester