[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an antihistamine used in eye drops to treat allergic conjunctivitis."}, {"from": "gpt", "value": "[C][C][O][C][C][N][C][=C][C][=C][C][=C][Ring1][=Branch1][N][=C][Ring1][=Branch2][N][C][C][C][N][Branch1][Branch1][C][C][Ring1][#Branch1][C]"}]