Ethyl 2-[5-(4-fluoro­phen­yl)pyridin-3-yl]-1-[3-(2-oxopyrrolidin-1-yl)prop­yl]-1H-benzimidazole-5-carboxyl­ate

In the title compound, C₂₈H₂₇FN₄O₃·H₂O, the benzimidazole ring system is essentially planar with a maximum deviation of 0.028 (1) Å. It makes dihedral angles of 47.59 (5) and 60.31 (5)°, respectively, with the pyridine and benzene rings, which make a dihedral angle of 22.58 (6)° with each other. The pyrrolidine ring shows an envelope conformation with one of the methyl­ene C atoms as the flap. In the crystal, the components are connected into a tape along the b-axis direction through O—H...O and O—H...N hydrogen bonds and a π–π inter­action between the pyridine and benzene rings [centroid–centroid distance of 3.685 (8) Å]. The tapes are further linked into layers parallel to the ab plane by C—H...O and C—H...F inter­actions.

N-[(3-Ethyl­phen­yl)carbamo­thio­yl]-2,2-di­phenyl­acetamide

In the title mol­ecule, C₂₃H₂₂N₂OS, the di­phenyl­acetyl and ethyl­benzene groups adopt a trans–cis conformation, respectively, with respect to the S atom across the (S=)C—N bonds. This conformation is stabilized by an intra­molecular N—H...O hydrogen bond and a weak C—H...S hydrogen bond. The ethyl-substituted benzene ring forms dihedral angles of 87.53 (15) and 73.94 (15)° with the phenyl rings. In the crystal, N—H...O hydrogen bonds link mol­ecules into chains along [100]. A weak C—H...π inter­action is also observed.

2-Amino-5-methyl­pyridinium 3-hy­droxy­pyridine-2-carboxyl­ate

In the 3-hy­droxy­picolinate anion of the title salt, C₆H₉N₂⁺·C₆H₄NO₃⁻, an intra­molecular O—H...O hydrogen bond with an S(6) graph-set motif is formed, so that the anion is essentially planar, with a dihedral angle of 9.55 (9)° between the pyridine ring and the carboxyl­ate group. In the crystal, the cations and anions are linked via N—H...O hydrogen bonds, forming a centrosymmetric 2 + 2 aggregate with R₂²(8) and R₄²(8) ring motifs. The crystal structure also features N—H...N and weak C—H...π inter­actions.

2-Amino-4-methyl­pyridinium 3-hy­droxy­benzoate

In the title salt, C₆H₉N₂⁺·C₇H₅O₃⁻, the anion is essentially planar, with a dihedral angle of 2.72 (17)° between the benzene ring and the carboxyl­ate group. In the crystal, the anions are connected by O—H...O hydrogen bonds, forming a 4₁ helical chain along the c axis. The protonated N atom and the 2-amino group of the cation are hydrogen bonded to the carboxyl­ate O atoms of the anion via a pair of N—H...O hydrogen bonds with an R₂²(8) ring motif. The ion pairs are further connected via another N—H...O hydrogen bond, resulting in a three-dimensional network.