Using COc1ccc(C=CC(=O)C=Cc2ccc(OC)c(OC)c2)cc1OC to produce O=C(C=Cc1ccc(O)c(O)c1)C=Cc1ccc(O)c(O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.