Using c1nc[nH]n1, O=C(Cc1ccc(F)cc1F)c1ccc(F)cc1 to produce O=C(Cc1ccc(F)cc1F)c1ccc(-n2cncn2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.