[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an antihistamine agent that is used for the treatment of allergic conditions, such as hay fever or urticaria."}, {"from": "gpt", "value": "[C][N][Branch1][C][C][C][C][C@@H1][Branch1][N][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][Br][C][=C][C][=C][C][=N][Ring1][=Branch1]"}]