Identification of a dehydrodimer of avenanthramide phytoalexin in oats

A new compound () was found to accumulate when oat leaves were treated with elicitors. A reaction with peroxidase and avenanthramide B, an oat phytoalexin, in the presence of hydrogen peroxide resulted in the formation of . The chemical structure of was determined to be a cyclic dehydrodimer of avenanthramide B based on spectroscopic analyses and chemical derivatization, and was named bisavenanthramide B.