[{"from": "human", "value": "Could you give me a brief overview of this molecule? [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]"}, {"from": "gpt", "value": "The molecule is a Histamine-1 Receptor Antagonist. The mechanism of action of diphenhydramine is as a Histamine H1 Receptor Antagonist."}]