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