Using CCCCCCC[C@@H]1O[C@@H]1CO, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce CCCCCCC[C@H]1O[C@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.