Using COC(=O)c1ccc2oc(C(O)C(Cc3ccccc3)NC(=O)OCc3ccccc3)nc2c1 to produce COC(=O)c1ccc2oc(C(O)C(N)Cc3ccccc3)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.