Using CS(=O)(=O)Cl, Cc1cc(Br)ccc1C(CCO)CNC(=O)OC(C)(C)C to produce Cc1cc(Br)ccc1C(CCOS(C)(=O)=O)CNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.