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The mol­ecules of ethyl 5-amino-1-(4-cyano­phen­yl)-1H-imidazole-4-carboxyl­ate, C13H12N4O2, are linked into a chain of alternating R22(10) and R44(34) rings by a combination of N-H...N and C-H...N hydrogen bonds. In ethyl 5-amino-1-(4-chloro­phen­yl)-1H-imidazole-4-carboxyl­ate, C12H12ClN3O2, where the ethyl group is disordered over two sets of sites, a combination of N-H...O, N-H...N, C-H...N and C-H...[pi](arene) hydrogen bonds links the mol­ecules into complex sheets. Two inter­molecular hydrogen bonds, one each of N-H...N and C-H...O types, link the mol­ecules of ethyl 5-amino-1-(2,6-difluoro­phen­yl)-1H-imidazole-4-carboxyl­ate, C12H11F2N3O2, into a continuous three-dimensional framework structure.
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