Using COCOc1ccc(C=CC(=O)c2c(O)cc(OCOC)cc2OCOC)cc1 to produce COCOc1ccc(CCC(=O)c2c(O)cc(OCOC)cc2OCOC)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.