Using CCCCCCCCCCCCC#CC(OCC)OCCCCO, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce CCCCCCCCCCCCC#CC(OCC)OCCCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.