Using O=C1c2ccccc2C(=O)N1CCCBr, Sc1ccc(Cl)c(Cl)c1 to produce O=C1c2ccccc2C(=O)N1CCCSc1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.