[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a Porphyrin Precursor and Optical Imaging Agent. The mechanism of action of aminolevulinic acid is as a Fluorescence Contrast Activity."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][C][N]"}]