STEROID ALKALOID GLYCOSIDES FROM SOLANUM-ROBUSTUM

Beta1-Solamargine and three new glycoalkaloids, robustine, N-hydroxyro bustine, and 25-acetoxyrobustine, have been isolated from the roots of Solanum robustum, the structures of which have been elucidated as yra nosyl-(1-->4)]-beta-D-glucopyranosyl}solasodine (3), its N-hydroxy, an d its 25-acetoxy derivative. These compounds have characteristic struc tures in comparison with the hitherto known Solanum glycoalkaloids.