[2-[4-[5-[4-acetyloxy-6-methyl-5-(6-methyl-5-oxo-oxan-2-yl)oxy-oxan-2- yl]oxy-4-dimethylamino-6-methyl-oxan-2-yl]oxy-2,5,12-trihydroxy-7-meth oxy-6,11-dioxo-3,4-dihydro-1H-tetracen-2-yl]-2-oxo-ethyl] acetate