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Chetomin is a natural product discovered from Chaetomium spp.and has some related fungal secondary metabolites with an unusual bridged disulphide diketopiperazine core.We became interested in chetomin initially because of its potent and selective anti-tumor activity attributable to reactive oxygen species (ROS) induction imposed by inhibition of the redox enzyme thioredoxin reductase and HIF-lα.