Using C[C@@H](CON)NC(=O)OC(C)(C)C, O=C(O)[C@@H]1CC[C@@H]2CN1C(=O)N2OCc1ccccc1 to produce C[C@@H](CONC(=O)[C@@H]1CC[C@@H]2CN1C(=O)N2OCc1ccccc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.