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