Identification and Characterization of Component Organic and Glycosidic Acids of Crude Resin Glycoside Fraction from Calystegia soldanella

摘要

Alkaline hydrolysis of the crude resin glycoside fraction of the leaves, stems, and roots of Calystegia soldanella R OEM . et S CHULT . (Convolvulaceae) gave four new glycosidic acids, named calysolic acids A, B, C, and D, along with one known glycosidic acid, soldanellic acid B, and three organic acids, 2 S -methylbutyric, tiglic, and 2 S ,3 S -nilic acids. The structures of the new glycosidic acids were characterized on the basis of spectroscopic data and chemical evidence.