Using COC(=O)c1ccc2[nH]nc(-c3cc4ccccc4s3)c2c1F to produce O=C(O)c1ccc2[nH]nc(-c3cc4ccccc4s3)c2c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.