Using O=C(Nc1ccccc1CCc1ccccc1C(=O)O)OCc1ccccc1, C=C(C)C to produce CC(C)(C)OC(=O)c1ccccc1CCc1ccccc1NC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.