Using CCOC(=O)c1cc(=O)c2c(o1)c1ccccc1n2-c1ccccc1 to produce O=C(O)c1cc(=O)c2c(o1)c1ccccc1n2-c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.