N-((5-O-(4,6-dideoxy-4-methylamino-3-O-(beta-D-glucopyranosyl)-beta-D-galactopyranosyl)-5,6,8,13-tetrahydro-1,5,6,9,14-pentahydroxy-11-methoxy-3-methyl-8,13-dioxobenzo(a)naphthacene-2-yl)carbonyl)-D-serine