Using COc1ccc(-c2cnc3[nH]c(=O)n(Cc4ccccc4)c3n2)cc1C(=O)O to produce O=C(O)c1cc(-c2cnc3[nH]c(=O)n(Cc4ccccc4)c3n2)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.