| Summary: | There are two cation–dianion pairs in the asymmetric unit of the title compound, C21H27ClN2O32+·2C6H2N3O7− {systematic name: 1-[2-(carboxymethoxy)ethyl]-4-[(R)-(4-chlorophenyl)phenylmethyl]piperazine-1,4-diium bis(2,4,6-trinitrophenolate)}. The piperazine group in the levocetirizinium cation is protonated at both N atoms. The acetyl end groups form R22(8) hydrogen-bonded motifs with adjacent cations. Each picrate anion interacts with the proponated N atom in the cation through a bifurcated N—H...O hydrogen bond, forming R12(6) ring motifs. Strong and weak intermolecular N—H...O and strong O—H...O hydrogen bonds, and weak π–ring and π–π stacking interactions [centroid–centroid distance = 3.7419 (14) Å] dominate the crystal packing, creating a three-dimensional supramolecular structure.
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