Using COC(=O)[C@@H]1Cc2ccccc2N1C(=O)COc1cccc2ccccc12 to produce O=C(O)[C@@H]1Cc2ccccc2N1C(=O)COc1cccc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.