[{"from": "human", "value": "Could you provide a description of this molecule? [O][S][=Branch1][C][=O][=Branch1][C][=O][O].[Fe]"}, {"from": "gpt", "value": "The molecule is a dark reddish-brown liquid. Colloidal suspension of an iron-dextran complex in water. pH 5.2-6.5."}]