Nafuredin, a new specific NADH-fumarate reductase inhibitor, was isolated from the culture broth of a fungal strain Aspergillusniger FT-0554. The stereoselective synthesis of three degradation products obtained by ozonolysis of nafuredin allowed elucidation of the absolute configuration of nafuredin.
spectrometry (MS/MS), exact mass measurement and isotopic labeling experiments, it has been established that the two trimethylsilyloxy groups in the TMS ethers interact across a wide range of distances via an ion-neutral complex. The migration of a TMS cation occurs when the group that is bound to carbon is expelled as a radical by an oxygen-directed cleavage to give a trimethylsilylated oxonium ion. If, on