Using O, COC(=O)c1ccc2cc(C(=O)[O-])c(C(=O)Nc3ccccc3)cc2c1 to produce O=C(O)c1ccc2cc(O)c(C(=O)Nc3ccccc3)cc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.