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