Using Nc1c(S(=O)(=O)C(F)(F)F)c(-c2ncon2)nn1-c1c(Cl)cc(C(F)(F)F)cc1Cl, COC(OC)OC to produce COC=Nc1c(S(=O)(=O)C(F)(F)F)c(-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.