2,6-Epoxy-2H-naphthaceno(1,2-b)oxocin-9,16-dione, 4-(dimethylamino)-11-ethoxy-3,4,5,6,11,12,13,14-octahydro-3,5,8,10,13-pentahydroxy-6,13-dimethyl-, (2R-(2alpha,3beta,4alpha,5beta,6alpha,11beta,13alpha))- 71582-50-8