Using OCC(COCc1ccccc1)(COCc1ccccc1)COCc1ccccc1, CC(C)=O to produce O=C(O)C(COCc1ccccc1)(COCc1ccccc1)COCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.