Using CCOC(=O)C(C)S, BrCc1cccc(-c2cccc(-c3cccc4c3oc3ccccc34)c2)c1 to produce COC(=O)C(C)SCc1cccc(-c2cccc(-c3cccc4c3oc3ccccc34)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.