Using OB(O)c1ccc(Cl)cc1Cl, CC/C=C(\CCC)c1c2cccc(Br)c2nn1C to produce CC/C=C(\CCC)c1c2cccc(-c3ccc(Cl)cc3Cl)c2nn1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.