Using CC(C)(C)OC[C@H](N)C(=O)OC(C)(C)C, O=C(N[C@@H](C(=O)O)c1ccccc1)OCc1ccccc1 to produce CC(C)(C)OC[C@H](NC(=O)[C@H](NC(=O)OCc1ccccc1)c1ccccc1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.