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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.
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Brewer et al. (1978) studied this question.
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