1-(Pyrrolidin-1-yl)ethan-1-iminium chloride.

The title compound, C6H13N2 +·Cl-, is as an amidinium salt that was isolated as unexpected product from the reaction between aceto-nitrile, chloro-form and pyrrolidine under refluxing conditions. The packing features two N-H⋯Cl hydrogen bonds to generate centrosymmetric tetra-mers (two cations and two anions) and van der Waals inter-actions.