[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}, {"from": "gpt", "value": "The molecule is a rare, non-protein amino acid and end-product of pyrimidine metabolism, excreted in urine and found in some antibiotics of fungal origin. With the exception of a few bacteria, it is non-metabolisable, and therefore used in bioassays. It is functionally related to a propionic acid and an isobutyric acid. It is a tautomer of a 2-aminoisobutanoic acid zwitterion."}]