[Structure of the antibiotic virenomycin].

To identify the structure of virenomycin, a new antitumor antibiotic consisting of components V and M, its acetyl and permethyl derivatives, as well as products of acid methanolysis and their derivatives were obtained. The IR-, NMR- and mass-spectra of the above compounds are presented. Based on an analysis of the spectral data the structure of virenomycin is suggested.