Using FC(F)(Br)Br, CC(C)(C)OC(=O)N1CCN(c2ncc(C=O)s2)CC1 to produce CC(C)(C)OC(=O)N1CCN(c2ncc(C=C(F)F)s2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.