Using COCOc1ccc(C=C2CCCC(=Cc3ccc(OCOC)c(OC)c3)C2=O)cc1OC to produce COc1cc(C=C2CCCC(=Cc3ccc(O)c(OC)c3)C2=O)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.