Using CCCOc1ccc(F)c2c(=O)c(-c3ccsc3C=O)c[nH]c12 to produce CCCOc1ccc(F)c2c(=O)c(-c3ccsc3CO)c[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.