Sporidesmins. Part 16. The structure of chetomin, a toxic metabolite of Chaetomium cochliodes, by nitrogen-15 and carbon-13 nuclear magnetic resonance spectroscopy

Abstract
Analysis of the 13C and 15N n.m.r. spectra of [15N6] chetomin biosynthesized by Chaetomium cochliodes established that the sporidesmin-like and 3-(ω-skatyl)-3,6-epidithiopiperazine-2,5-dione fragments are linked by a bond between the indole nitrogen and the quaternary β-indoline carbon.