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The title compound, C5H6ClN3O, is essentially planar with a maximum deviation of 0.0256 (11) Å for all non-H atoms. In the crystal, adjacent mol­ecules are linked by a pair of N—H...N hydrogen bonds, forming an inversion dimer with an R22(8) ring motif. The dimers are further linked via N—H...O hydrogen bonds into an undulating sheet structure parallel to the bc plane.

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In the title salt, C6H9N2+·C2F3O2, the F atoms of the anion are disordered over two sets of sites, with refined occupancies in a ratio of 0.505 (17):0.495 (17). In the crystal, cations and anions are linked via N—H...O hydrogen bonds, forming R22(8) ring motifs. The ionic units are linked into a two-dimensional network parallel to (100) by N—H...O and weak C—H...O hydrogen bonds. The crystal structure is further stabilized by weak C—H...F hydrogen bonds, resulting in a three-dimensional network.

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In the title salt, 2C4H6ClN4+·C4H2O42−, the complete fumarate dianion is generated by crystallographic inversion symmetry. The cation is essentially planar, with a maximum deviation of 0.018 (1) Å. In the anion, the carboxyl­ate group is twisted slightly away from the attached plane, the dihedral angle between the carboxyl­ate and (E)-but-2-ene planes being 12.78 (13)°. In the crystal, 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, forming an R22(8) ring motif. In addition, another type of R22(8) motif is formed by centrosymmetrically related pyrimidinium cations via N—H...N hydrogen bonds. These two combined motifs form a heterotetra­mer. The crystal structure is further stabilized by stong N—H...O, N—H...Cl and weak C—H...O hydrogen bonds, resulting a three-dimensional network.

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The asymmetric unit of the title compound, 2C5H6ClN3O·C4H6O4, consists of one 4-chloro-6-meth­oxy­pyrimidin-2-amine mol­ecule and one half-mol­ecule of succinic acid which lies about an inversion centre. In the crystal, the acid and base mol­ecules are linked through N—H...O and O—H...N hydrogen bonds, forming a tape along [1-10] in which R22(8) and R42(8) hydrogen-bond motifs are observed. The tapes are further inter­linked through a pair of C—H...O hydrogen bonds into a sheet parallel to (11-2).

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The base mol­ecule of the title co-crystal, C7H10N2O2S·C7H6O3, is essentially planar, with a maximum deviation of 0.0806 (14) Å for all non-H atoms. The acid mol­ecule is also nearly planar, with a dihedral angle of 8.12 (14)° between the benzene ring and the carb­oxy group. In the crystal, the acid mol­ecules form an inversion dimer through a pair of O—H...O hydrogen bonds with an R22(8) ring motif. The pyrimidine mol­ecules are linked on both sides of the dimer into a heterotetra­mer via O—H...N and C—H...O hydrogen bonds with R22(8) ring motifs. The heterotetra­mers are further linked by weak C—H...O hydrogen bonds, forming a tape structure along [1-10].

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The benzoic acid mol­ecule of the title compound, C4H5ClN4·C7H6O2, is approximately planar, with a dihedral angle of 1.28 (9)° between the carb­oxy group and the benzene ring. In the crystal, two acid and two base mol­ecules are linked through N—H...O and O—H...N hydrogen bonds, forming a centrosymmetric 2 + 2 unit with R22(8) and R42(8) motifs. These units are further linked through a pair of N—H...N hydrogen bonds into a tape structure along [1-20]. The crystal structure also features weak π–π [centroid–centroid distance = 3.5984 (11) Å] and C—H...π inter­actions.

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In the 4-meth­oxy­quinoline-2-carboxyl­ate anion of the title salt, C5H8N3+·C11H8NO3, the dihedral angle between the quinoline ring system and the carboxyl­ate group is 16.54 (15)°. In the crystal, the cations and anions are linked via N—H...O and N—H...N hydrogen bonds, forming a centrosymmetric 2 + 2 aggregate with R22(9) and R42(8) ring motifs. These units are further connected via N—H...O hydrogen bonds into a layer parallel to the bc plane. The crystal structure is also stabilized by weak C—H...O hydrogen bonds and π–π inter­actions between pyridine rings [centroid–centroid distance = 3.5886 (8) Å] and between pyridine and benzene rings [centroid–centroid distance = 3.6328 (8) Å].
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