In the mol-ecule of the title compound, C(18)H(12)N(2)OS, the tetra-hydro-benzo[h]quinoline fused-ring system is buckled owing to the ethyl-ene -CH(2)CH(2)- fragment, the benzene ring and the pyridine ring being twisted by 16.0 (1)°. The 4-substituted aromatic ring is bent away from the pyridine ring by 59.5 (2)° (for the major disordered thienyl component) in order to avoid crowding the cyanid...

The piperidine ring of the title compound, C(16)H(15)N(5), adopts a chair conformation. The pyridine ring is essentially planar, with a maximum deviation of 0.035 (3) Å. The pyrrole and pyridine rings are almost coplanar, forming a dihedral angle of 3.48 (14)°. In the crystal, no classical hydrogen bonds were found. In the crystal, the molecules are linked by aromatic π-π stacking [centroid-cen...

The title compound, C(25)H(18)N(4)O, is a non-planar bipolar ligand containing triphenyl-amine and 1,3,4-oxadiazole units. In the mol-ecule, the benzene ring, the 1,3,4-oxadiazole ring, and the pyridine ring are twisted slightly with respect to each other [dihedral angle between the benzene and 1,3,4-oxadiazole rings = 9.4 (4) and between the 1,3,4-oxadiazole and pyridine rings = 3.0 (4)°]. Mor...

Dacarbazine is an antitumor prodrug which is used for the treatment of malignant metastatic melanoma and Hodgkin’s disease. It requires initial activation in liver through an N-demethylationreaction. The active metabolite prevents the progress of disease via alkylation of guanine bases in DNA strands. In order to investigate the importance of imidazole ring and its dynamictautomerization in ant...

In the crystal structure of the title compound, C(15)H(10)FNO, the furan ring makes dihedral angles of 40.04 (11) and 25.71 (11)° with the pyridine and 4-fluoro-phenyl rings, respectively. The pyridine ring makes a dihedral angle of 49.51 (10)° with the 4-fluoro-phenyl ring. Non-conventional C-H⋯F and C-H⋯N hydrogen bonds are effective in the stabilization of the crystal structure.

In the title compound, C(20)H(29)N(5)O(4), the pyridine ring makes a dihedral angle of 10.41 (16)° with the triazole ring, which exhibits an azo-like character. In the crystal, mol-ecules are linked by C-H⋯O and C-H⋯N hydrogen bonds, and C-H⋯π inter-actions involving a methyl group and the pyridine ring of a neighbouring mol-ecule, leading to the formation of a three-dimensional network.

In the title compound, C(19)H(21)Cl(2)NO(4), the dihydro-pyridine ring adopts a flattened boat conformation. The dichloro-phenyl ring is oriented almost perpendicular to the planar part of the dihydro-pyridine ring [dihedral angle = 89.1 (1)°]. An intra-molecular C-H⋯O hydrogen bond is observed. In the crystal structure, mol-ecules are linked into chains along the b axis by N-H⋯O hydrogen bonds.

The title Schiff base compound, C(15)H(16)N(2)O(2), was prepared by the condensation reaction of equimolar quanti-ties of 3-eth-oxy-salicyl-aldehyde with 2-amino-3-methyl-pyridine in methanol. The dihedral angle between the benzene ring and the pyridine ring is 2.6 (2)° and an intra-molecular O-H⋯N hydrogen bond generates an S(6) ring.

The title nitro-phenyl pyridine compound, C(20)H(22)N(2)O(6) was synthesized as a degradation product of the hypertension medication nisoldipine. The dihedral angle between the nitro-substituted phenyl ring and the pyridine ring is 75.5 (4)°. There are a number of C-H⋯O inter-actions between symmetry-related mol-ecules>.

In the title compound, C17H27N3OS2, the amide group is approximately coplanar with the pyridine ring [dihedral angle = 1.6 (1)°], whereas the di-thio-carbamate group is nearly perpendicular to the pyridine ring [dihedral angle = 76.7 (1)°]. In the crystal, pairs of weak C-H⋯O hydrogen bonds link the mol-ecules into inversion dimers.