Using CSc1ncnc2cc(N)ncc12, Nc1ccc(C(F)(F)F)cc1 to produce Nc1cc2ncnc(Nc3ccc(C(F)(F)F)cc3)c2cn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.