4-chloro-2H-phthalazin-1-one

4-Chloro-2H-phthalazin-1-one is a heterocyclic organic compound in which a phthalazinone ring is substituted with a chlorine atom at the 4-position. It typically appears as a solid and belongs to the class of nitrogen-containing aromatic compounds. This compound is primarily used as an intermediate in organic synthesis and in the development of pharmaceutical and bioactive molecules.