The title compound, C14H16N3O3Br, is a derivative of gabazine that is a potent inhibitor of GABAA receptor. The crystal belongs to space group P21/n with the cell dimensions a = 7.6258(4), b = 19.309(2), c = 10.6700(7)Å and β = 108.283(5)°. The final R value is 0.044. The phenyl ring is inclined to the pyridazine ring by 10.0(2)°. The intramolecular hydrogen bond restricts the conformation of the carboxypropyl group.
