[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a Histamine-1 Receptor Antagonist. The mechanism of action of alcaftadine is as a Histamine H1 Receptor Antagonist."}, {"from": "gpt", "value": "[C][N][C][C][C][=Branch2][Ring1][#Branch1][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][C][N][C][Ring1][O][=N][C][=C][Ring1][Branch1][C][=O][C][C][Ring2][Ring1][=Branch1]"}]