10-[4-dimethylamino-5-[4-hydroxy-6-methyl-5-(6-methyl-5-oxo-oxan-2-yl) oxy-oxan-2-yl]oxy-6-methyl-oxan-2-yl]oxy-6,8,11-trihydroxy-8-(2-hydrox yacetyl)-1-methoxy-9,10-dihydro-7H-tetracene-5,12-dione