Using COc1ccc(Cn2ccc3cc(OC4CCC5(CC4)OCCO5)c(Cl)cc3c2=O)cc1 to produce COc1ccc(Cn2ccc3cc(OC4CCC(=O)CC4)c(Cl)cc3c2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.