4-(3-hydroxy-1,4-dioxo-1,4-dihydro-[2]naphthyl)-2-oxo-but-3-enoic acid

1,3-dimethoxy-2-hydroxyanthraquinone

N,N'-diacetyl-2-nitro-1,4-naphthalenediamine

2,3-dihydroxy-1-nitro-anthraquinone

1,2-dihydroxy-4-methyl-3-nitro-anthraquinone