Using CCC1(NC(=O)OC(C)(C)C)CCC(Oc2ncnc3sc4c(c23)[C@@H](CCO)CC4)CC1, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce CCC1(NC(=O)OC(C)(C)C)CCC(Oc2ncnc3sc4c(c23)[C@@H](CC(=O)O)CC4)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.