Using COCOc1ccc(C=CC(=O)c2c(OC)cc(OC)c(CC=C(C)C)c2O)cc1OC to produce COCOc1ccc(CCC(=O)c2c(OC)cc(OC)c(CCC(C)C)c2O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.