Using C=CC(=O)OC(C)(C)C, CCOC(=O)C(F)N1C(=O)c2ccccc2C1=O to produce CCOC(=O)C(F)(CCC(=O)OC(C)(C)C)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.