[{"from": "human", "value": "Describe this molecule. [C][NH2+1][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of sarcosine; major species at pH 7.3. It is a tautomer of a sarcosine."}]