A new caffeoylquiniclactone, named neochlorgeniclatone, was isolated from the leaves of Betula platyphylla Suk. The structure was established by spectroscopic
The structure of a new abietane diterpenoid,taxayunnin (1),from the barks of Taxus yunnanensis,was determined by spectroscopic analysis.A known abietane diterpe
Semiempirical PM3 and density function theory B3LYP/3-2 1 g* calculations in vacuum and in water indicated that the 'syn' orientation was preferred in t