Using COC(=O)c1cc(C(=O)OC)c2c(n1)C(=O)C(=O)c1cc(C(=O)OC)[nH]c1-2 to produce O=C(O)c1cc(C(=O)O)c2c(n1)C(=O)C(=O)c1cc(C(=O)O)[nH]c1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.