p-benzoquinonedibenzenesulphonamide

H3B*NH2C6H4-4-NH2*BH3

4-N-(9-benzyl-2-chloropurin-6-yl)benzene-1,4-diamine

2,3,5,5,6,6-hexachlorocyclohex-2-ene-1,4-dione

1-(4-chlorophenyl)-N-[4-[(4-chlorophenyl)methylideneamino]phenyl]methanimine