Bepostastine besylate

The crystal structure of bepotastine besylate {systematic name: 1-(3-carboxypropyl)-4-(4-chlorophenyl)(pyridin-2-yl)methoxypiperidin-1-ium benzenesulfonate, C 21 H 26 ClN 2 O 3 + ·C 6 H 5 O 3 S − ) was refined using synchrotron X-ray powder diffraction data, and optimized using density functional theory techniques. Bepotastine besylate crystallizes in the space group P 1, with a = 8.0153 (6), b = 9.8211 (5), c = 10.2345 (10) Å, α = 88.164 (2), β = 68.962 (2), γ = 65.8917 (8)°, V = 680.149 (1) Å 3 and Z = 1 at 298 K. N—H...O and O—H...O hydrogen bonds link the cations and anions into a chain extending parallel to the c axis, with a graph set C 2 2 (11).