[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][Branch1][=C][C][=Branch1][#Branch2][=C][C][=Branch1][Branch1][=C][Ring1][=Branch1][O][O][18F][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is a fluorinated analog of [levodopa] used as a diagnostic agent for positron emission tomography (PET) in the evaluation of Parkinsonian syndromes. Fluorodopa F 18 PET is used adjunctly with other diagnostic investigations and serves primarily to visualize dopaminergic nerve terminals in the striatum."}]