Using C=CCOC(=O)NC(CC(=O)OC(C)(C)C)C(O)Cc1ccccc1 to produce C=CCOC(=O)NC(CC(=O)OC(C)(C)C)C(=O)Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.