Propiverinium picrate

disorder in main residue; R factor = 0.046; wR factor = 0.126; data-to-parameter ratio = 23.5. The title compound [systematic name: 4-(2,2-diphenyl-2-propoxyacetoxy)-1-methylpiperidin-1-ium picrate], C23H30NO3 +C6H2N3O7, crystallizes as a salt with one cation–anion (propiverinium picrate) pair in the asymmetric unit. A significant number of conformational changes are observed between the crystalline environment of this cation– anion salt and that of a density functional theory (DFT) calculation of the geometry-optimized structure. The angle between the dihedral planes of the two benzyl rings in the propiverinium cation increases by 14.4 (0) from that of the crystalline environment. The dihedral angles between the mean planes of each of the benzyl rings and the mean plane o