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The asymmetric unit of the title compound, C26H18N6O4S, contains two independent mol­ecules (A and B). The dihedral angles between the oxadiazole ring and naphthalene ring system are 42.59 (14) and 6.88 (14) Å in mol­ecules A and B, respectively. The dihedral angles between the pyridine and benzene rings in A and B are 65.53 (13 )and 87.67 (13) Å, respectively. In the crystal, mol­ecules A and B are linked through a pair of N—H...N hydrogen bonds involving one -NH2 group H atom and second pair of N—H...N hydrogen bonds involving the other -NH2 group H atom, forming an –ABAB– ribbon along [100] containing R22(8) and R22(12) ring motifs. These ribbons are further connected by weak C—H...N, C—H...O and C—H...π inter­actions, resulting in a three-dimensional network. The crystal studied was a non-merohedral twin with refined components 0.906 (1):0.094 (1).

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In the title compound, C15H12FN3O2, the dihedral angles between the central benzene ring and the pendant benzene and oxa­diazole rings are 45.05 (13) and 15.60 (14)°, respectively. The C atom of the meth­oxy group is roughly coplanar with its attached ring [displacement = 0.178 (4) Å]. In the crystal, N—H...N hydrogen bonds link the mol­ecules into [010] chains. Weak C—H...π inter­actions are also observed.

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In the title compound, C7H8N6O2S, the dihedral angle between the imidazole and thia­diazole rings is 70.86 (15)°. In the crystal, mol­ecules are linked into [10-1] chains by N—H...N hydrogen bonds, which incorporate centrosymmetric R22(8) and R22(18) loops. The chains are linked by C—H...O and C—H...N inter­actions, generating a three-dimensional network. Very weak π–π stacking [centroid–centroid distance = 3.901 (17) Å] is also observed.
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