Using CC(C)OC(=O)OCOC(=O)[C@H]1[C@@H]2[C@H](O)[C@@H](OCc3ccc(Cl)c(Cl)c3)[C@@](NC(=O)OC(C)(C)C)(C(=O)OCOC(=O)OC(C)C)[C@H]12 to produce CC(C)OC(=O)OCOC(=O)[C@H]1[C@@H]2[C@H](O)[C@@H](OCc3ccc(Cl)c(Cl)c3)[C@@](N)(C(=O)OCOC(=O)OC(C)C)[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.