title: Two new trans-clerodane diterpenoids from Otostegia limbata.
abstract: Two new tricyclic clerodane-type diterpenoids, limbatolide D (1) and limbatolide E (2), have been isolated from the roots of Otostegia limbata. Their structures and the relative configuration were established on the basis of spectral methods, especially two-dimensional (2D) NMR techniques.
authors: International Centre for Chemical Sciences, H.E.J. Research Institute of Chemistry, University of Karachi, Karachi, Pakistan. vuahmad@cyber.net.pk
authors: V U
authors: VU
authors: Ahmad
authors: A
authors: A
authors: Khan
authors: U
authors: U
authors: Farooq
authors: F
authors: F
authors: Kousar
authors: S S
authors: SS
authors: Khan
authors: J
authors: J
authors: Hussain
mesh_terms: D045785:Diterpenes, Clerodane / Q000737:chemistry / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D013058:Mass Spectrometry; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D009904:Optical Rotation; D018517:Plant Roots / Q000737:chemistry; D013051:Spectrometry, Gamma; D013056:Spectrophotometry, Ultraviolet
chemical_list: D045785:Diterpenes, Clerodane