Using COC(=O)C=Cc1ccccc1Oc1ccc(CC(NC(=O)OC(C)(C)C)C(=O)O)cc1 to produce COC(=O)CCc1ccccc1Oc1ccc(CC(NC(=O)OC(C)(C)C)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.