[{"from": "human", "value": "Provide a description 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 first generation antihistamine that is used for symptoms of allergic rhinitis and the common cold. It is also commonly used as a mild sleeping aid. Diphenhydramine has not been linked to instances of clinically apparent acute liver injury."}]