N-(15,16-Dihydroxylinoleoyl)-glutamine and N-(15,16-epoxylinoleoyl)-glutamine isolated from oral secretions of lepidopteran larvae

N-(15,16-Dihydroxylinoleoyl)-glutamine () and N-(15,16-epoxylinoleoyl)-glutamine () and were identified in the regurgitant of lepidopteran larvae (Spodoptera exigua and Spodoptera frugiperda) by LC–MS. After methanolysis and derivatisation with MSTFA, the positions of the hydroxy groups of were identified by GC–MS. The structures of both conjugates were confirmed by synthesis.