Experimental Crystal data

R factor = 0.041; wR factor = 0.117; data-to-parameter ratio = 12.1. In the title compound (systematic name: 2-amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-3-ium 2-chloroacetate), C4H8-N3O +C2H2ClO2, the molecular aggregations are stabilized through classical (N—H O) and non-classical (C—H O and C—H N) hydrogen-bonding interactions. The cations are linked to the anions, forming ion pairs through two N— H O bonds that produce characteristic R22(8) ring motifs. These cation–anion pairs are connected through another N— H O hydrogen bond, leading to an R42(8) ring motif. Further weak C—H N interactions link the molecules along the a axis, while other C—H O interactions generate zigzag chains extending along b. Related literature For related structures, see: Ali et al. (2011a,b); Bahadur, Kannan et al. (2007); Bahadur, Sivapragasam et al. (2007); Bahadur, Rajalakshmi et al. (2007). For hydrogen-bond motifs