Using BrC(Br)(Br)Br, Cc1oc(-c2ccccc2)nc1COc1ccc(CO)cc1 to produce Cc1oc(-c2ccccc2)nc1COc1ccc(CBr)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.