Using COC(=O)c1cc2c([nH]1)CCC2c1cc(F)cc(F)c1 to produce O=C(O)c1cc2c([nH]1)CCC2c1cc(F)cc(F)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.