Using O=C(O)CCC[C@@H](NC(=O)OCc1ccccc1)C(=O)OCc1ccccc1, C=C(C)C to produce CC(C)(C)OC(=O)CCC[C@@H](NC(=O)OCc1ccccc1)C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.