Using COc1ccccc1-c1c[nH]c2ncc(-c3cc(C(=O)C(=O)N(C)C)ncn3)cc12 to produce COc1ccccc1-c1c[nH]c2ncc(-c3cc(C(O)C(=O)N(C)C)ncn3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.