Using COC(=O)c1ccc2oc(=O)n(Cc3ccc4[nH]c(=O)[nH]c4c3)c2c1 to produce O=C(O)c1ccc2oc(=O)n(Cc3ccc4[nH]c(=O)[nH]c4c3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.