[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C@@H1][Branch1][#Branch2][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][S][Branch1][=Branch1][C][=Branch1][C][=O][O][S]"}, {"from": "gpt", "value": "A mercaptodicarboxylic acid used as an antidote to heavy metal poisoning because it forms strong chelates with them."}]