4-(2,7-Dimethyl-4-oxo-1,3-thiazolo[4,5-d]pyridazin-5-yl)benzenesulfonamide

4-(2,7-Dimethyl-4-oxo-1,3-thiazolo[4,5-d]pyridazin-5-yl)benzenesulfonamide

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The thiazole–pyridazine fused-ring system of the title compound, C13H12N4O3S2, is approximately planar (r.m.s.

deviation = 0.037 Å); the benzene ring connected to the fused-ring system through the N atom is twisted by aptamil allerpro 39.3 (1)°.

The amine group uses an H atom to form a hydrogen bond to the ketonic O atom of an inversion-related molecule to generate a dimer; adjacent natio celebrate eyeshadow palette dimers are linked by an N—H.O hydrogen bond to form a linear chain.