[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a chemical compound of iron and bromine. It is used as a Lewis acid catalyst in the halogenation of aromatic compounds. Bromine is a halogen element with the symbol Br and atomic number 35. Diatomic bromine does not occur naturally, but bromine salts can be found in crustal rock. (L625, L654)"}, {"from": "gpt", "value": "[Fe+3].[Br-1].[Br-1].[Br-1]"}]