[{"from": "human", "value": "Create a molecule with the structure as the one described. A guanidinium antihypertensive agent that acts by blocking adrenergic transmission."}, {"from": "gpt", "value": "[C][N][C][=Branch1][Ring1][=N][C][N][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]