Using O=C1CCC(=O)N1Br, Cc1cc(Cl)ccc1-c1ncsc1-c1ccc(Cl)cc1C to produce Cc1cc(Cl)ccc1-c1nc(Br)sc1-c1ccc(Cl)cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.