[{"from": "human", "value": "Please give me some details about this molecule. [C][Branch1][#Branch2][C][Branch1][=Branch1][13C][=Branch1][C][=O][O][N][13C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a (13)C-modified compound that is apspartic acid in which the carbon atoms at postions 1 and 4 are present as their (13)C isotopes. It is a (13)C-modified compound and an aspartic acid."}]