Using COC(=O)CN(C(=O)CCc1nc2c(F)c(F)cc(F)c2s1)c1ccccc1 to produce O=C(O)CN(C(=O)CCc1nc2c(F)c(F)cc(F)c2s1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.