Using OB(O)c1ccc(Cl)cc1, O=c1[nH]nc2c(I)c(Br)ccn12 to produce O=c1[nH]nc2c(-c3ccc(Cl)cc3)c(-c3ccc(Cl)cc3)ccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.