(2R,3S,4S,5R,6S,11S,13S)-4-(dimethylamino)-3,5,8,10,13-pentahydroxy-6,13-dimethyl-11-propoxy-3,4,5,6,11,12,13,14-octahydro-2H-2,6-epoxytetraceno[1,2-b]oxocine-9,16-dione