Using Cn1c(C(F)(F)F)cc(=O)n(-c2ccc3snc(C=O)c3c2)c1=O, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce Cn1c(C(F)(F)F)cc(=O)n(-c2ccc3snc(C(=O)O)c3c2)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.