(2E)-2-(4-Chlorobenzylidene)-N'-[(E)-(4-chlorophenyl)methylene]hydrazinecarboximidohydrazide hydrochloride (1:1); (2E)-2-(4-chlorobenzylidene)-N'-[(E)-(4-chlorophenyl)methylidene]hydrazinecarboximidohydrazide hydrochloride (1:1); Bis[(4-chlorophenyl)methylene]carbonimidic dihydrazide monohydrochloride; carbonimidic dihydrazide, N'',N'''-bis[(1E)-(4-chlorophenyl)methylene]-, hydrochloride (1:1); (1E)-2-{(E)-amino[(2E)-(4-chlorobenzylidene)hydrazinylidene]methyl}-1-(4-chlorobenzylidene)hydrazinium chloride