Using COC(=O)c1cc2c(C(=O)CNC(C)C)ccc(O)c2[nH]1 to produce COC(=O)c1cc2c(C(O)CNC(C)C)ccc(O)c2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.