Butanoic acid, 2-[[[[[4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacenyl]carbonyl]amino]methyl]amino]-4-(methylsulfinyl)-, monosodium salt Butyric acid, 2-[[[4-(dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro-3,6,10,12,12a-pentahydroxy-6-methyl-1,11-dioxo-2-naphthacene-carboxamido]methyl]amino]-4-(methylsulfinyl)-, sodium salt NSC64431