title: 4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-[2-(2-methyl-4-oxo-6,7,8,9-tetra-hydro-4H-pyrido[1,2-a]pyrimidin-3-yl)eth-yl]piperidinium nitrate.
abstract: In the risperidone cation of the title compound, C(23)H(28)FN(4)O(2) (+)·NO(3) (-), the piperidine ring adopts a chair conformation and the tetra-hydro-pyridine ring is disordered over two orientations in a 0.620 (11):0.380 (11) ratio. N-H⋯O, C-H⋯O and C-H⋯F hydrogen bonds are present in the crystal structure.
authors.forename: Yu
authors.initials: Y
authors.lastname: Sun
authors.forename: Huai-Hong
authors.initials: HH
authors.lastname: Zhang