Using O=C1c2[nH]c3cc(Cl)c(Cl)cc3c2CCC1(Br)Cc1ccccc1 to produce Oc1c(Cc2ccccc2)ccc2c1[nH]c1cc(Cl)c(Cl)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.