Using NCC(F)(F)F, O=C1OC(=O)c2cc(C(F)(F)F)ccc21 to produce O=C1c2ccc(C(F)(F)F)cc2C(=O)N1CC(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.