[{"from": "human", "value": "Describe this molecule. [C][=C][Branch1][O][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][Cl]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion obtained from L-2-amino-4-chloropent-4-enoic acid by transfer of a proton from the carboxy group to the amino group. It is the major species at pH 7.3. It is a tautomer of a L-2-amino-4-chloropent-4-enoic acid."}]