Levocetirizinium dipicrate

There are two cation–dianion pairs in the asymmetric unit of the title compound, C(21)H(27)ClN(2)O(3) (2+)·2C(6)H(2)N(3)O(7) (−) {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 R (2) (2)(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 R (1) (2)(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.