Using O=C(O)c1ccc(C(F)(F)F)cc1CCc1cccc(Br)c1 to produce O=C1c2ccc(Br)cc2CCc2cc(C(F)(F)F)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.