Using COC=Nc1cc(-c2ncon2)nn1-c1c(Cl)cc(C(F)(F)F)cc1Cl to produce Nc1cc(-c2ncon2)nn1-c1c(Cl)cc(C(F)(F)F)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.