2-Amino-5-chloro­pyridinium 2-carb­oxy­benzoate–benzene-1,2-dicarb­oxy­lic acid (3/1)

The asymmetric unit of the title compound, 3C(5)H(6)ClN(2) (+)·3C(8)H(5)O(4) (−)·C(8)H(6)O(4), contains three independent 2-amino-5-chloro­pyridinium cations, three independent hydrogen phthal­ate anions and one phthalic acid mol­ecule. In the crystal structure, there are two kinds of supra­molecular tapes. One is formed by two independent cations with two anions through N—H⋯O and C—H⋯O hydrogen bonds. Another one is formed by the other cation and anion, and the phthalic acid mol­ecule via N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds. These two tapes are connected by an O—H⋯O hydrogen bond, forming a double-tape structure.