Using BrC(Br)(Br)Br, COc1ccc2[nH]c3ccc4c(c3c2c1)C(=O)N(CCO)C4=O to produce COc1ccc2[nH]c3ccc4c(c3c2c1)C(=O)N(CCBr)C4=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.