Using BrC(Br)(Br)Br, Cc1oc(-c2ccccc2)nc1CCOc1ccc(CCC(=O)OC(C)(C)C)c(CO)c1 to produce Cc1oc(-c2ccccc2)nc1CCOc1ccc(CCC(=O)OC(C)(C)C)c(CBr)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.