Using CS(=O)(=O)Cl, CC(C)(C)OC(=O)N[C@H](CCO)Cc1ccc(C(F)(F)F)cc1 to produce CC(C)(C)OC(=O)N[C@H](CCOS(C)(=O)=O)Cc1ccc(C(F)(F)F)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.