Using OB(O)c1cccs1, COc1cccc(C(=O)c2cn(C(=O)OC(C)(C)C)c3ncc(Br)cc23)c1F to produce COc1cccc(C(=O)c2cn(C(=O)OC(C)(C)C)c3ncc(-c4cccs4)cc23)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.