Using COC(=O)COc1ccc(F)c(Cc2c[nH]c3ncc(-c4cccnc4)cc23)c1F to produce O=C(O)COc1ccc(F)c(Cc2c[nH]c3ncc(-c4cccnc4)cc23)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.