Using COC(=O)c1ccc2c(c1)C(=O)C1(O2)C(=O)Nc2ncccc21 to produce COC(=O)c1ccc2c(c1)CC1(O2)C(=O)Nc2ncccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.