6-Phenyl-3(2H)-pyridazinone-4-carboxylic acid ethyl ester

Ethyl 3-oxo-6-phenyl-2,3-dihydro-4-pyridazinecarboxylate is used as a reactant in the chlorination and amidation of 3-aminopyridazine derivatives with atypical antidepressant, serotonergic and dopaminergic activity.