Using CSc1cccc(C(O)Cc2ccncc2)c1, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce CSc1cccc(C(=O)C(=O)c2ccncc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.