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