Using CCOC(=O)CCc1ccc(OCc2cc(OC)c(CO)s2)cc1F to produce CCOC(=O)CCc1ccc(OCc2cc(OC)c(C=O)s2)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.