Using COc1c(F)cc(-c2ccc(C(F)(F)F)cc2)cc1C=O, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce COc1c(F)cc(-c2ccc(C(F)(F)F)cc2)cc1C(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.