6-Methyl-3(2H)-Pyridazinone

6-​Methyl-​3-​pyridazinone is a lignin-based dye used on wool. 6-​Methyl-​3-​pyridazinone is also used as a reactant for the synthesis of C-​(1-​aryl-​cyclohexyl)​-​methylamine derivatives as selective, orally available inhibitors of dipeptidyl peptidase IV, imidazopyridazinone derivatives as PDE7 inhibitors and pyridazinone derivatives with an arylpiperazinylalkyl chain as a potentent, orally active, antinociceptive agent.