[{"from": "human", "value": "Describe this molecule. [C][=C][C][S][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of S-allylcysteine. Major species at pH 7.3. It has a role as a metabolite. It is a tautomer of a S-allylcysteine."}]