Using COCCN(CCc1ccc(Br)nc1)C(=O)OC(C)(C)C, Clc1ccnc2ccsc12 to produce COCCN(CCc1ccc(-c2cc3nccc(Cl)c3s2)nc1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.