Resin Glycosides. XI. Operculins III, IV, IX, X, XVI, XVII and XVIII, New Ether-Soluble Resin Glycosides of Rhizoma Jalapae Braziliensis (Root of Ipomoea operculata)

Abstract

Ten ether-soluble resin glycosides (jalapins), operculins IX-XVIII, were isolated from Rhizoma Jalapae Braziliensis (roots of Ipomoea operculata). Operculins III and IV previously obtained, and operculins IX, X, XVI, XVII and XVIII were characterized on the bases of chemical and spectral data. All of them have a common glycosidic acid, operculinic acid B, with a macrocyclic ester structure and n-decanoyl and/or n-dodecanoyl residues as organic acid groups.