N1,N1'-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) tetrahydrochloride; 1,2-Ethanediamine, N,N'-bis(2-aminoethyl)-, tetrahydrochloride; 1,2-Ethanediamine, N1,N2-bis(2-aminoethyl)-, hydrochloride (1:4);