[{"from": "human", "value": "Provide a description of this molecule. [O][S][=Branch1][C][=O][=Branch1][C][=O][O].[Fe]"}, {"from": "gpt", "value": "The molecule is a dark brown, slightly viscous liquid complex of ferric hydroxide and dextran for intravenous or intramuscular use. Iron Dextran is used for the treatment of patients with documented iron deficiency in which oral administration is unsatisfactory or impossible."}]