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