In the title compound, CHNOS, the five-membered ring is essentially planar. The substituents at the nitro-gen atoms subtend a C-N-N-S torsion angle of -95.52 (6)°. The amino group forms an intra-molecular hydrogen bond to a sulfonyl oxygen atom; two inter-molecular hydrogen bonds from the amino group, to the other S=O group and to the oxo substituent, form a layer structure parallel to the plane. The structure determination confirms that the title compound is - rather than -alkyl-ated.
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