A New Penta β-D-Glucopyranosyl Diterpene from Stevia rebaudiana

摘要

A new steviol diterpene glycoside, 13-[(2-O-β-D-glucopyranosyl-β-D-glucopyranosyl)oxy] ent-kaur-16-en-19-oic acid-{2-O-[6-O-β-D-glucopyranosyl)-β-D-glucopyranosyl]-β-D-glucopyranosyl} ester (1) has been isolated from the commercial extract of the leaves of Stevia rebaudi-ana Bertoni. Structure of the new compound has been established on the basis of extensive NMR spectroscopy (1H &13C, TOCSY, HMQC, and HMBC) and High Resolution (HR) mass spectroscopic data as well as enzymatic and acid hydrolysis studies.