The title molecule, C14H12N2O2, consists of a pyridazine ring fused to a five-membered pyrrole ring and to an isoindole moiety. The pyrrole ring and the isoindole moiety are planar, defining a dihedral angle of 35 degrees, while the pyridazine ring adopts an envelope conformation. The isoindole ring and the hydroxy group are in a cis configuration.