l-Lysine l-lysinium dichloride nitrate

In the title compound, 2C₆H₁₅N₂O₂⁺·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) Å. Molecule I is engaged in a zigzag (Z1) head-to-tail sequence. Both chloride anions link mol­ecules I and II through the α- and ɛ-amino groups in an infinite chain along the a axis. The nitrate ion shows orientational disorder.