Using CC(=O)OC(C)=O, COC(=O)C1(C)CC(O)OC1COCc1ccccc1 to produce COC(=O)C1(C)CC(OC(C)=O)OC1COCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.