Inoculation of Chinese cabbage heads with the bacterium Pseudomonas cichorii induced the production of three major phytoalexins named methoxybrassinin (l), brassinin (2), and cyclobrassinin (3), whose structures have been elucidated on the basis of spectroscopic studies and synthesis.
The isolation and structure elucidation of spirobrassinin, the first phytoalexin of oxindole structure from the daikon Raphanus sativus L. var. hortensis, is described.
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