Di-2-pyridyl ketone 4-methyl-4-phenylthiosemicarbazone.

The molecule of the title compound, C(19)H(17)N(5)S, adopts a Z configuration about the azomethine bond and exists as the thione tautomer. The overall structure of the molecule is distributed in four different planes. An intramolecular hydrogen bond involving the pyridyl N atom and the H atom attached to the hydrazine N atom leads to the formation of a six-membered ring.