title: Antimicrobial triterpenoids from Vladimiria muliensis.
abstract: A new triterpenoid with a rearranged ursane skeleton, 3beta-acetoxyl-11alpha-methoxybauer-8-en-7alpha-ol ( 1), two new ursane triterpenoids, 1alpha,5alpha-dioxy-11alpha-hydroxyurs-12-en-3-one ( 2) and urs-3beta,13alpha,18beta-triol ( 3), together with three known ursane triterpenoids ( 4- 6) were isolated from the rhizome of Vladimiria muliensis. Their structures were elucidated on the basis of spectroscopic methods (IR, EIMS, HRESIMS, 1D and 2D NMR, and X-ray crystallography diffraction). Compounds 2 and 4 exhibited modest antimicrobial activity against Escherichia coli, Candida albicans, Pseudomonas aeruginosa, Enterococcus faecalis, Bacillus cereus, and Staphylococcus aureus.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Chen
authors.forename: Dong-Qing
authors.initials: DQ
authors.lastname: Fei
authors.forename: Sheng-Gao
authors.initials: SG
authors.lastname: Chen
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D019659:Asteraceae / Q000737:chemistry*; D001409:Bacillus cereus / Q000187:drug effects; D002176:Candida albicans / Q000187:drug effects; D004365:Drugs, Chinese Herbal; D013293:Enterococcus faecalis / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D027343:Rhizome / Q000737:chemistry; D013211:Staphylococcus aureus / Q000187:drug effects; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: D000890:Anti-Infective Agents; D004365:Drugs, Chinese Herbal; D014315:Triterpenes