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The title compound, C12H15N3O2S, adopts an E configuration with respect to the C=N bond. The propionate group adopts an antiperiplanar (ap) conformation. There are short intramolecular N—H...N and C—H...O contacts, forming S(5) and S(6) ring motifs, respectively. In the crystal, molecules are connected into ribbons extending parallel to [010] by pairs of N—H...S interactions, forming rings with R22(8) graph-set motifs, and by pairs of C—H...S interactions, where rings with the graph-set motif R21(7) are observed. The O atom of the carbonyl group is disordered over two positions, with a refined occupancy ratio of 0.27 (2):0.73 (2). The studied crystal consisted of two domains.