Using O=C([O-])[O-], Cc1ccc(-c2nnc(CC(C)C)o2)cc1CC(=O)O to produce COC(=O)Cc1cc(-c2nnc(CC(C)C)o2)ccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.