Using Fc1cnc(Cl)nc1-c1ccc(Cl)c(Cl)c1, OCC(F)(F)F to produce FC(F)(F)COc1cnc(Cl)nc1-c1ccc(Cl)c(Cl)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.