In the title compound, C9H9ClN4OS, the dihedral angle between the acetamide moiety and the pyridine ring is 4.83 (12)°. The O=C-C-Cl torsion angle is 46.4 (3)° and an intra-molecular C-H⋯O inter-action generates an S(6) ring. In the crystal, mol-ecules are linked by N-H⋯O, N-H⋯N and C-H⋯N hydrogen bonds, generating sheets lying parallel to (120).
Keywords: N-[4-amino-5-cyano-6-(methylsulfanyl)pyridin-2-yl]-2-chloroacetamide; crystal structure; hydrogen bonding; polyfunctional pyridines.