Methyl 3-[3-(ethoxy-carbon-yl)thio-ureido]-1H-pyrazole-5-carboxyl-ate

The title compound, C(9)H(12)N(4)O(4)S, was proven to be the product of the reaction of methyl 5-amino-1H-pyrazole-3-carboxyl-ate with ethyl isothio-cyanato-carbonate. All non-H atoms of the mol-ecule are planar, the mean deviation from the least squares plane being 0.048 Å. The intra-molecular N-H⋯O bond involving the NH-group, which links the thio-urea and pyrazole fragments, closes a six-membered pseudo-heterocyclic ring, and two more hydrogen bonds (N-H⋯O with the participation of the pyrazole NH group and N-H⋯S involving the second thio-urea NH group) link the mol-ecules into infinite chains running along [10].