3,3,4,4-tetramethoxycyclobutane-1,2-dicarbonitrile

5-amino-6-phenylpyridine-3,4-dicarbonitrile

5-amino-2-methyl-6-phenylpyridine-3,4-dicarbonitrile

ethyl 3-amino-4,5-dicyanopyridine-2-carboxylate

ethyl 3-amino-4,5-dicyano-6-methylpyridine-2-carboxylate