3,8-dihydronaphtho[b]cyclobutene-1,2-dione

5,16-dihydro-5,16-[1,2]benzenobenzo[g]phthalazino[2,3-b]phthalazine-7,14-dione

2,2-dibromocyclobuta[b]naphthalen-1-one

2,2-dibromo-1,1-dichlorocyclobuta[b]naphthalene

1,1,2,2-Tetrabromnaphtho[b]cyclobuten