Structure determination of the antibiotic desertomycin B by fast‐atom bombardment mass spectrometric techniques

Abstract
By means of different fast‐atom bombardment (FAB) mass spectrometric techniques (i.e., positive‐ and negative‐ion FAB ionizations and high resolution measurements) we have determined the chemical structure of desertomycin B which is a novel representative of the family of macrolide antibiotics carrying a guanidino function in its side‐chain.