Loco Intoxication: Indolizidine Alkaloids of Spotted Locoweed ( Astragalus lentiginosus )

Abstract
The indolizidine alkaloids swainsonine and swainsonine N-oxide were isolated and identified as constituents of spotted locoweed. The inhibition of lysosomal .alpha.-mannosidase by these alkaloids suggested that they were the causative agents of locoism in range animals.