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The mol­ecules of ethyl 4-(5-amino-3-methyl-1H-pyrazol-1-yl)­benzoate, C13H15N3O2, are linked by two independent N—H...O hydrogen bonds into a chain of edge-fused and alternating R42(8) and R22(20) rings. A combination of N—H...N and N—H...O hydrogen bonds links the mol­ecules of methyl 4-(5-amino-3-tert-butyl-1H-pyrazol-1-yl)benzoate, C15H19N3O2, into sheets of alternating R22(20) and R66(32) rings. In 4-(5-amino-3-methyl-1H-pyrazol-1-yl)benzoic acid monohydrate, C11H11N3O2·H2O, the mol­ecular components are linked into a three-dimensional framework structure by a combination of five independent hydrogen bonds, two of O—H...N type and one each of O—H...O, N—H...O and N—H...N types.

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Mol­ecules of methyl 4-[(5-methyl-1H-pyrazol-3-yl)amino]-3-nitro­benzoate, C12H12N4O4, (I), exhibit a polarized (charge-separated) structure in the nitro­aniline portion. The mol­ecules are linked into chains of edge-fused R22(16) and R22(22) rings by a combination of N-H...O(carbon­yl) and C-H...O(nitro) hydrogen bonds. Methyl 1-(5-methyl-1H-pyrazol-3-yl)-1H-benzimidazole-5-carboxyl­ate, C13H12N4O2, (II), which is readily formed from (I) by reduction followed by ring formation, crystallizes with Z' = 2 in the space group P\overline{1}. Each of the two independent mol­ecular types is linked into sheets of R44(28) rings by a combination of N-H...N and C-H...O(carbon­yl) hydrogen bonds.

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In methyl 4-(5-amino-3-phenyl-1H-pyrazol-1-yl)-3-nitro­benzo­ate, C17H14N4O4, the molecules are linked into complex sheets by a combination of N-H...N, N-H...O and C-H...O hydrogen bonds. In the isomeric methyl 3-nitro-4-[(5-phenyl-1H-pyrazol-3-yl)amino]­benzo­ate, mol­ecules exhibit a polarized mol­ecular-electronic structure and are linked into chains of edge-fused rings by a combination of N-H...O and C-H...O hydrogen bonds.
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