C₈H₅O₃N₃S₂ crystallizes in space group P2₁/c with D_m=1.56 (2) in a mixture of dimethyl-formamide and methyl ethyl ketone. On the other hand, in acetone, the title compound crystallizes in space group C2/c with lattice parameters a-25.66 (4), b=7.360 (5), c=11.05 (8)Å, β=105.0 (3)°; Z=8; D_m=1.70 (2), D_x=1.68Mg·m^-3. The molecular structure was investigated by X-ray diffraction analysis of a single crystal; the final R value was 0.04 for 1823 reflections. The molecules related by a center of symmetry lie one above the other along the b axis and these stacks are linked by intermolecular hydrogen bonding between N-H…N of the amidic group and the thiazole ring, respectively.