2-azidonaphthalene-1,4-dione

2-(1,4-dioxonaphthalen-2-yl)naphthalene-1,4-dione

2-bromo-3-phenylsulfanylnaphthalene-1,4-dione

1,3-dimethylanthracene-9,10-dione

3-bromo-4-hydroxynaphthalene-1,2-dione