[{"from": "human", "value": "Create a molecule with the structure as the one described. A mercaptodicarboxylic acid used as an antidote to heavy metal poisoning because it forms strong chelates with them."}, {"from": "gpt", "value": "[C@@H1][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][S][Branch1][=Branch1][C][=Branch1][C][=O][O][S]"}]