Using N#C[Cu], CCCCCc1cnc(-c2cc(F)c(Br)c(F)c2)nc1 to produce CCCCCc1cnc(-c2cc(F)c(C#N)c(F)c2)nc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.