Using O=C(Cl)OCC(Cl)(Cl)Cl, CC1=C(C(=O)OCC(Cl)(Cl)Cl)N2C(=O)[C@@H](N)[C@H]2SC1 to produce CC1=C(C(=O)OCC(Cl)(Cl)Cl)N2C(=O)[C@@H](NC(=O)OCC(Cl)(Cl)Cl)[C@H]2SC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.