title: Two new lanostane triterpenoids from the branches and leaves of Polyalthia oblique.
abstract: Two new lanostane triterpenoids, 20-hydroxyeuphorbol-7-one (1) and 15α-hydroxyeuphorbol-7,11-dione (2), together with four known triterpenoids, euphorbol-7-one (3), friedelin (4), stigmast-4-ene-6α-ol-3-one (5), stigmasta-4-en-3,6-dione (6), were isolated from ethanol extract of the branches and leaves of Polyalthia obliqua. The structures of 1 and 2 were elucidated on the basis of extensive spectroscopic analysis and comparisons with related known compounds. Antibacterial activities of two new compounds and four known compounds were tested.
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Liu-Kai
authors.initials: LK
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Cai-Juan
authors.initials: CJ
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Xiao-Bao
authors.initials: XB
authors.lastname: Li
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Guang-Ying
authors.initials: GY
authors.lastname: Chen
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Chang-Ri
authors.initials: CR
authors.lastname: Han
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China.
authors.forename: Wen-Hao
authors.initials: WH
authors.lastname: Chen
authors.affiliation: Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, Hainan, China. sxp628@126.com.
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Song
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D031044:Polyalthia / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D014315:Triterpenes