Using C=CC(COC(c1ccccc1)(c1ccccc1)c1ccccc1)OCC(=O)OC(C)(C)C to produce C=CC(COC(c1ccccc1)(c1ccccc1)c1ccccc1)OCC=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.