Ethyl 5-amino-1-(4-chloro-2-nitro­phen­yl)-1H-pyrazole-4-carboxyl­ate

In the mol­ecule of the title compound, C12H11ClN4O4, the pyrazole ring is coplanar with the amino and ethoxy­carbonyl groups within 0.026 (2) and 0.105 (2) A, respectively. The C6 ring of the 4-chloro-2-nitro­phenyl group is twisted by 53.58 (4)° relative to the plane of the pyrazole ring. The planar structure of the pyrazole ring is stabilized by an intra­molecular N—H⋯O hydrogen bond between its substituents. Neighbouring mol­ecules are linked through inter­molecular N—H⋯N and N—H⋯O hydrogen bonds, giving rise to one-dimensional tapes along the b axis. Mol­ecules in the chain are linked to those of an adjacent chain through weak C—H⋯O inter­actions, forming a three-dimensional network.