Using CCOC(=O)CCCn1cc(C(=O)c2ccc(OC(CCO)c3ccccc3)cc2)c2ccccc21, BrC(Br)(Br)Br to produce CCOC(=O)CCCn1cc(C(=O)c2ccc(OC(CCBr)c3ccccc3)cc2)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.