Using Cc1cccnc1-c1ccc(CO)cc1, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce Cc1cccnc1-c1ccc(C(=O)O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.