L-Lysine l-lysinium dichloride nitrate

In the title compound, 2C(6)H(15)N(2)O(2)(+).H+. NO3-. 2Cl(-), both the monoprotonated lysinium molecules are bonded through a strong, nearly symmetric, O-H . . .O hydrogen bond forming a dimer. The O . . .O distance is 2.425 (8) Angstrom. Molecule I is engaged in a zigzag (Z1) head-to-tail sequence. Both chloride anions link molecules I and II through the alpha- and epsilon -amino groups in an infinite chain along the a axis. The nitrate ion shows orientational disorder.