title: Four new trisnorlanostene-type triterpenoids from the stem bark of Pinus luchuensis.
abstract: Four new 25,26,27-trisnorlanostene-type triterpenoids were isolated from the stem bark of Pinus luchuensis, together with five known compounds. These new compounds were characterized as 25,26, 27-trisnor-3 alpha-hydroxy-lanost-9(11)-en-24-oic acid (1), 25,26, 27-trisnor-3 alpha-methoxy-lanost-9(11)-en-24-oic acid (2), 25,26, 27-trisnor-3 beta-methoxy-lanost-9(11)-en-24-oic acid (3), and 25,26, 27-trisnor-3-oxo-lanost-9(11)-en-24-oic acid (4) on the basis of MS and NMR evidence.
authors.affiliation: Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan. wada@oysun01.oups.ac.jp
authors.forename: S
authors.initials: S
authors.lastname: Wada
authors.forename: R
authors.initials: R
authors.lastname: Tanaka
mesh_terms: D002850:Chromatography, Gel; D002855:Chromatography, Thin Layer; D032462:Cycadopsida / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D013055:Spectrophotometry, Infrared; D014197:Trees / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D014315:Triterpenes