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.
D. Brewer, A. G. McInnes, D. G. Smith, A. Taylor, J. A. Walter, H. R. Loosli and Z. L. Kis, J. Chem. Soc., Perkin Trans. 1, 1978, 1248 DOI: 10.1039/P19780001248
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