[2R-(2alpha,3beta,4alpha,5beta,6alpha,11alpha,13alpha)]-4-(dimethylamino)-3,4,5,6,11,12,13,14-octahydro-3,5,8,10,13-pentahydroxy-11-methoxy-6,13-dimethyl-2,6-epoxy-2H-naphthaceno[1,2-b]oxocin-9,16-dione