[{"from": "human", "value": "Describe this molecule. [C][Branch1][#Branch2][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][N][S]"}, {"from": "gpt", "value": "The molecule is a sulfur-containing amino-acid anion that is the conjugate base of cysteine, obtained by deprotonation of the carboxy group. It is an alpha-amino-acid anion and a sulfur-containing amino-acid anion. It is a conjugate base of a cysteine and a cysteine zwitterion. It is a conjugate acid of a cysteinate(2-)."}]