[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a cysteine derivative."}, {"from": "gpt", "value": "[C][=C][C][S][=Branch1][C][=O][C][/C][=C][/S][S][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][N]"}]