title: Chemical constituents of Nouelia insignis Franch.
abstract: Two new diterpenes and ent-15alpha-hydroxykaur-16-en-19-oic acid 11,12-acetonide (3), together with 23 known compounds were isolated from the dried aerial parts of Nouelia insignis Franch. The structures of new compounds were determined to be ent-14beta,15alpha-dihydroxykaur-16-en-19-oic acid (1), ent-14beta-hydroxy-15-oxokaur-16-en-19-oic acid (2) on the basis of spectral and chemical evidence. The structure of ent-11alpha,16alpha-epoxy-15alpha-hydroxy-16S-kaur-19-oic acid (4) was confirmed by X-ray crystallographic analysis.
authors.affiliation: Northwest Sci-Tech University of Agriculture and Forestry, Yangling, China.
authors.forename: X-Y
authors.initials: XY
authors.lastname: Hu
authors.forename: Y-Gang
authors.initials: YG
authors.lastname: Luo
authors.forename: Xiao-Zhen
authors.initials: XZ
authors.lastname: Chen
authors.forename: Le
authors.initials: L
authors.lastname: Zhou
authors.forename: Guo-Lin
authors.initials: GL
authors.lastname: Zhang
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry*