Using O=C(O)C1CCc2c(c3ccccc3n2C(=O)c2ccccc2)C1, CC(C)(C)C(=O)OCCl to produce CC(C)(C)C(=O)OCOC(=O)C1CCc2c(c3ccccc3n2C(=O)c2ccccc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.