[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a member of guanidines. It has a role as an adrenergic antagonist and an antihypertensive agent."}, {"from": "gpt", "value": "[C][N][C][=Branch1][Ring1][=N][C][N][C][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]