Using BrC(Br)(Br)Br, C=CCOC(=O)C(CCO)N(C)S(=O)(=O)c1ccc(Oc2ccccc2)cc1 to produce C=CCOC(=O)C(CCBr)N(C)S(=O)(=O)c1ccc(Oc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.