Using CC(C)(C)OC(=O)CC(=O)OC(C)(C)C, CC(C)(C)[O-] to produce CC(C)(C)OC(=O)C(CCOCc1ccccc1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.