Ethyl 1-(4-chloro-benz-yl)-3-phenyl-1H-pyrazole-5-carboxyl-ate.

In the title compound, C(19)H(17)ClN(2)O(2), the pyrazole ring makes dihedral angles of 6.97 (5) and 79.25 (1)°, respectively, with the phenyl and chlorophenyl rings, respectively. In the crystal, C-H⋯O hydrogen bonds are observed.

Ethyl 8-(4-nitro-phen-yl)imidazo[1,2-a]pyridine-7-carboxyl-ate.

In the title compound, C(16)H(13)N(3)O(4), the imidazo[1,2-a]pyridine and benzene rings make a dihedral angle of 56.21 (2)°. The crystal packing is stabilized by weak π-π stacking inter-actions [centroid-centroid distances = 3.787 (2) Å] and C-H⋯O inter-molecular hydrogen-bonding inter-actions.