Using O=C(O)C(F)F, Cc1cn(-c2cccc(C(F)(F)F)c2)c(=N)s1 to produce Cc1cn(-c2cccc(C(F)(F)F)c2)c(=NC(=O)C(F)F)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.