Using CCOC(=O)C(C(=O)OCC)c1cc(=O)n(-c2ccccc2)c2ccccc12 to produce O=C(O)Cc1cc(=O)n(-c2ccccc2)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.