Grayanane diterpenoids from pieris formosa
Two new diterpenoids, pierisformoside A (1) and pierisformosin D (2), and two known diterpenoids, asebotoxins VIII (3) and V (4), were isolated from leaves of Pieris formosa. Their structures were elucidated on the basis of spectral analysis, including 1H-1H COSY, 13C-1H COSY, HMBC, and NOESY experiments.
Wang
LQ
Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 200031, China, and Department of Chemistry, The University of Hong Kong, Hong Kong, China.
Chen
SN
Qin
GW
Cheng
KF