[{"from": "human", "value": "Describe this molecule. [C][C@H1][Branch1][Branch2][C][C][13C][=Branch1][C][=O][O][C@H1][C][C][C@@H1][C@@][Ring1][Branch1][Branch2][Ring1][P][C@H1][Branch2][Ring1][N][C][C@H1][C@H1][Ring1][=Branch1][C@@H1][Branch2][Ring1][C][C][C@H1][C@@][Ring1][=Branch1][Branch1][#Branch2][C][C][C@H1][Branch1][Ring2][C][Ring1][=Branch1][O][C][O][O][C]"}, {"from": "gpt", "value": "The molecule is a preparation of carbon C 13-labeled cholic acid with potential diagnostic applications. Upon intravenous administration, cholic acid-24-13C levels may be used to measure first pass hepatic extraction of cholate, which is influenced primarily by portal blood flow and portal-systemic shunt."}]