[{"from": "human", "value": "Please give me some details about this molecule. [C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][F][C][=Branch1][Branch1][=C][N][Ring1][Branch2][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "5-fluorotryptophan can be used as substrate analogue to study enzyme mechanisms by NMR spectroscopy."}]