[{"from": "human", "value": "Provide a description of this molecule. [C][/C][=C][/C@H1][Branch2][=Branch1][=Branch2][C][=Branch1][C][=O][N][/C][\\-Ring1][=Branch1][=C][\\C][=C][Branch2][Branch1][#Branch2][C][=Branch2][Ring2][#C][=C][Branch1][Ring2][N][Ring1][Branch1][/C][=C][/C][=Branch2][Ring1][N][=C][Branch2][Ring1][#Branch1][/C][=Branch1][P][=C][/C][=N][C][=Branch1][C][=O][C][=Branch1][Branch1][=C][Ring1][=Branch1][C][C][=C][/N][\\-Ring1][#C][C][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C]"}, {"from": "gpt", "value": "The molecule is a member of the class of bilins which functions as the chromophore of light-sensing phytochromes in plants. It has a role as a cofactor and a phytochrome chromophore. It is a conjugate acid of a phytochromobilin(2-)."}]