[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a pyridazine that has found use as an antihypertensive agent It was once marketed in France under the tradename Normatensyl."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][O][=N][N][=C][Ring1][=Branch1][C][=Branch1][C][=O][N][N][N]"}]