[2R-(2alpha,3beta,4alpha,5beta,6alpha,11beta,13alpha,14alpha)]-11-[(6-deoxy-3-C-methyl-2,3,4-tri-O-methyl-alpha-L-mannopyranosyl)oxy]-4(dimethylamino)-3,4,5,6,9,11,12,13,14,16-decahydro-3,5,8,10,13-pentahydroxy-6,13-dimethyl-9,16-dioxo-2,6-epoxy-2H-naphthaceno[1,2-b]oxocin-14-carboxylic acid methyl ester