Using Cc1nc2c(Cl)cccc2c(Cl)c1C, Nc1cc(Br)ccc1N1CCOCC1 to produce Cc1nc2c(Cl)cccc2c(Nc2cc(Br)ccc2N2CCOCC2)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.