Using CC(Br)Br, O=c1cc(OCc2ccc(Cl)cn2)ccn1-c1ccc(O)cc1 to produce O=c1cc(OCc2ccc(Cl)cn2)ccn1-c1ccc(OCCBr)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.