title: Eucosterol-type nortriterpenoids from Merwilla natalensis.
abstract: The bulbs of Merwilla natalensis have yielded two known homoisoflavanones, the known spirocyclic homoisoflavanone, scillascillin, four known nortriterpenoids, and the new nortriterpenoid, (22R,23S)-17alpha,23-epoxy-22,29-dihydroxy-27-nor-lanost-8-en-3,24-dione (1), bisnortriterpenoid, (22R,23S)-17alpha,23-epoxy-3beta,22,24xi-trihydroxy-27,28-bisnor-lanost-8-ene (2), and trisnortriterpenoid, (23S)-17alpha,23-epoxy-3beta,24xi-dihydroxy-27,28,29-trisnor-lanost-8-ene (3). The structures of 1-3 were determined by spectroscopic methods.
authors.affiliation: Natural Products Research Group, School of Pure and Applied Chemistry, University of KwaZulu-Natal, Durban 4041, South Africa.
authors.forename: Nivan
authors.initials: N
authors.lastname: Moodley
authors.forename: Dulcie A
authors.initials: DA
authors.lastname: Mulholland
authors.forename: Neil R
authors.initials: NR
authors.lastname: Crouch
mesh_terms: D007810:Lanosterol / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000302:isolation & purification*; D019668:Liliaceae / Q000737:chemistry*; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013019:South Africa; D013237:Stereoisomerism; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D014315:Triterpenes; D007810:Lanosterol