Using CCCC[Sn](CCCC)(CCCC)c1c(OC(C)C)c(=O)c1=O, Brc1ccccc1I to produce CC(C)Oc1c(-c2ccccc2Br)c(=O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.