Using Clc1ccc(C2CNc3ccccc3S2)cc1, O=C(Cl)CCCBr to produce O=C(CCCBr)N1CC(c2ccc(Cl)cc2)Sc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.