3-(3-chloroanilino)pyrazine-2,5-dicarbonitrile

3-[(3,5-dibromo-4-oxocyclohexa-2,5-dien-1-ylidene)amino]-1,4-dihydropyrazine-2,5-dicarbonitrile

3-(2-cyano-4-nitroanilino)pyrazine-2,5-dicarbonitrile

3-(4-fluoroanilino)pyrazine-2,5-dicarbonitrile

3-[3-(trifluoromethyl)anilino]pyrazine-2,5-dicarbonitrile