Using CI, OC(Cn1cncn1)(c1ccc(F)cc1F)C(F)(F)SC1CC1 to produce COC(Cn1cncn1)(c1ccc(F)cc1F)C(F)(F)SC1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.