2,4-Dichloro-7-fluoro­quinazoline

The mol­ecule of the title compound, C₈H₃Cl₂FN₂, is essentially planar, with a maximum deviation of 0.018 (2) Å. In the crystal, π–π stacking is observed between parallel quinazoline moieties of adjacent mol­ecules, the centroid–centroid distance being 3.8476 (14) Å.

Pyrrolidine-2,5-dione

In the title compound, C₄H₅NO₂, the non-H atoms are nearly coplanar, with a maximum deviation of 0.030 (1) Å. In the crystal, pairs of mol­ecules are linked by N—H...O hydrogen bonds into inversion dimers.

Adipic acid–2,6-bis­(1H-benzimidazol-2-yl)pyridine–water (1/2/4)

The asymmetric unit of the title hydrated co-crystal, 2C₁₉H₁₃N₅·C₆H₁₀O₄·4H₂O, consists of one 2,6-bis­(1H-benzimidazol-2-yl)pyridine mol­ecule, half of an adipic acid mol­ecule (bis­ected by an inversion center) and two water solvates. In the crystal, N—H...O, O—H...O and O—H...N hydrogen bonds and π–π inter­actions [centroid–centroid distances = 3.769 (2) and 3.731 (2) Å] form a three-dimensional supra­molecular structure.