Using COC(=O)C1(N2OC[C@@H](NC(=O)Cc3ccccc3)C2=O)C=CC(=O)O1 to produce COC(=O)C1(N2OC[C@@H](NC(=O)Cc3ccccc3)C2=O)CCC(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.