Methyl 4′-(4-fluoro­phen­yl)-1′-methyl-3′-nitro­methyl-2-oxospiro­[indoline-3,2′-pyrrolidine]-3′-carboxyl­ate

In the title compound, C₂₁H₂₀FN₃O₅, the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7)° with the oxindole unit and the fluoro­phenyl ring, respectively. The pyrrolidine ring assumes an envelope conformation with the spiro C atom as the flap. The crystal packing features weak N—H...N and C—H...O hydrogen bonds.

[4-(4-Meth­oxy­phen­yl)-1-methyl-3-nitro­pyrrolidin-3-yl]methanol

In the title compound, C₁₃H₁₈N₂O₄, the dihedral angle between the benzene and pyrrolidine (all atoms) rings is 70.6 (1)°. The pyrrolidine ring adopts a half-chair conformation. In the crystal, mol­ecules form chains along the c-axis direction linked by O—H...N hydrogen bonds, which are then connected by C—H...O inter­actions, forming a sheet parallel to the bc plane.

4-Methyl­anilinium 4-hy­droxy­benzene­sulfonate

In the crystal of the title molecular salt, C₇H₁₀N⁺·C₆H₅O₄S⁻, the benzene­sulfonate units are linked through phenol–sulfonate O—H...O hydrogen bonds, forming chains along the c-axis direction. These chains are linked via N—H...O hydrogen bonds involving two of the three H atoms of the ammonium group of the 4-methyl­anilium cation, giving rise to two-dimensional networks parallel to the bc plane which are further connected through an additional N—H...O inter­action in which the third ammonium H atom is involved, generating a three-dimensional network.

2-Amino-5-nitro­pyridinium tri­fluoro­acetate

The title salt, C₅H₆N₃O₂⁺·C₂F₃O₂⁻, crystallizes with two cations and two anions in the asymmetric unit. In the crystal, the acetate and pyridine groups are linked by a pair of N—H...O hydrogen bonds, forming loops described by the graph-set motif R₂²(8). These loops are linked via N—H...O hydrogen bonds, forming chains along [001]. The chains are in turn linked by C—H...O and C—H...F hydrogen bonds, generating a three-dimensional supra­molecular network. In both anions, the O and F atoms are disordered over two sites, with occupancy ratios of 0.852 (3):0.148 (3) and 0.851 (3):0.149 (3).

2-Chloro-1-(3,3-dimethyl-2,6-di­phenyl­piperidin-1-yl)ethanone

In the title compound, C₂₁H₂₄ClNO, the piperidine ring adopts a chair conformation. The two phenyl rings are inclined to one another by 20.7 (1)°, and are inclined to the mean plane of the four planar atoms of the piperidine ring by 87.64 (10) and 70.8 (1)°. The mol­ecular structure features short intra­molecular C—H...Cl and C—H...O contacts. In the crystal, there are no significant inter­molecular inter­actions present.