[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a Histamine-1 Receptor Antagonist. The mechanism of action of diphenhydramine is as a Histamine H1 Receptor Antagonist."}, {"from": "gpt", "value": "[C][N][Branch1][C][C][C][C][O][C][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1]"}]