Crystal structure of 3-methyl­pyridine-2-carbaldehyde 4-methyl­thio­semi­carba­zone monohydrate

In the title hydrate, C(9)H(12)N(4)S·H(2)O (systematic name: 3-methyl-1-{(E)-[(3-methyl­pyridin-2-yl)methyl­idene]amino}­thio­urea monohydrate), a small twist is noted between the pyridine ring and the rest of the organic mol­ecule [dihedral angle = 6.96 (5)°]. The imine and pyridine N atoms are syn, and the amine H atoms are anti. The latter arrangement allows for the formation of an intra­molecular N—H⋯N(imine) hydrogen bond. Both the N-bonded H atoms form hydrogen bonds to symmetry-related water mol­ecules, and the latter forms O—H hydrogen bonds with the pyridine N and thione S atoms. These inter­actions lead to supra­molecular layers that stack along the a-axis direction with no specific inter­actions between them.