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The title compound, C6H11N3O2S, consists of a roughly planar molecule (r.m.s deviation from planarity = 0.077 Å for the non-H atoms) and has the S atom in an anti position to the imine N atom. This N atom is the acceptor of a strongly bent internal N—H...N hydrogen bond donated by the amino group. In the crystal, molecules are arranged in undulating layers parallel to (010). The molecules are linked via intermolecular amino–carboxyl N—H...O hydrogen bonds, forming chains parallel to [001]. The chains are cross-linked by Ncarbazone—H...S and C—H...S interactions, forming infinite sheets.

The title compound, C6H11N3O3·0.5H2O, has two independent molecules and one molecule of water in the asymmetric unit. The crystal packing is stabilized by intermolecular N—H...N, O—H...O, N—H...O and C—H...O hydrogen bonds. These interactions form a two-dimensional array in the ab plane with a zigzag motif which has an angle close to 35° between the zigzag planes. The hydrogen bonding can be best described using the graph-set notation as N1 = C(10)R22(10)R22(8) and N2 = R64(20)R22(8).