Using CC1(CCl)S[C@@H]2C(NC(=O)Cc3ccccc3)C(=O)N2C1C(=O)OCC(Cl)(Cl)Cl to produce CC1(CCl)S[C@@H]2C(NC(=O)Cc3ccccc3)C(=O)N2C1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.