Benzoic acid, 2-hydroxy-, 3-(aminocarbonyl)-8-(2,6-dideoxy-4-O-(2-methyl-1-oxo-2-butenyl)-beta-D-arabino-hexopyranosyl)-1,4,4a,6,11,11a,12,12a-octahydro-2,5,7-trihydroxy-4a,11-dimethoxy-11-methyl-4,6-dioxo-1-naphthacenyl ester, (1R-(1a,4aalpha,11.beta))