14 a toxin produced by the microorganism Pseudomonas cocovenenans, has a sufficiently high affinity for the translocator on the inside of this membrane to block effectively the export of ATP. Ib Reported herein is the first chemical synthesis of 1, a substance only difficultly available by fermentation, which serves as a useful biochemical reagent and which is of interest also from a structural and biosynthetic point of view.
