Ding Lisheng

Clerodane diterpenoids from Kinostemon alborubrum

Three new clerodane diterpenoids, kinalborin A (1), B (2), and C(3), together with six known diterpenoids, teuperin A (4), montanin E (5), teulamifin B (6), teuflin (7), montanin D (8), and teupernin B (9), have been isolated from the whole plant of Kinostemon alborubrum (HEMSL.) C. Y. Wu et S. CHOW, a Chinese endemic herb. Their structures were established by spectral methods, and those of kinalborins A (1) and C (3) were confirmed by X-ray diffraction.

A Novel Withanolide Glucoside from the Rhizomes of Dioscorea panthaica

A novel withanolide type C-28-steroid saponin, named dioscolide glucoside, was isolated from the rhizomes of Dioscorea panthaica Prain et Buckill. The structure was elucidated as (20S,22R,24R,25S)-1-oxo-2 alpha,3 alpha;6 alpha,7 alpha-diepoxy-5 alpha,16 alpha,25 alpha-trihydroxy-withanolide-27-O-glucopyranoside by spectroscopic evidence including 2D-NMR.