– Clitocine, an adenosine analogue derived from mushrooms, is a potent transcriptional readout agent, an inhibitor of nonsense mutations, and has anticancer activity, inducing the production of p53 protein in cells carrying the p53 nonsense mutation allele.Clitocine enhances TRAIL-mediated apoptosis in human colon cancer cells by promoting Mcl-1 degradation.NSC 81464 is an alkaloid of the yohimbine type extracted from the roots and leaves of Rauwolfia vomitoria.