Using Clc1ccc2c(c1)NCC2, O=C1Nc2cc(Cl)ccc2C1(Br)Cc1cccc(Cl)c1 to produce O=C1Nc2cc(Cl)ccc2C1(Cc1cccc(Cl)c1)N1CCc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.