Using COc1ccc2c(c1)C(Cc1ccccc1)=C(CC(=O)OCc1ccccc1)CC2 to produce COc1ccc2c(c1)C(Cc1ccccc1)C(CC(=O)O)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.