title: Labdane diterpenes from Otostegia fruticosa.
abstract: The new labdane diterpenes otostegin A (2), otostegin B (6) and 15-epi-otostegin B (7) were isolated from the aerial parts of Otostegia. fruticosa, besides the previously known labdanes preleoheterin (1), leoheterin (3), leopersin C and 15-epi-leopersin C (4, 5), ballonigrin (9) and vulgarol (11), along with the iridoid glucoside 8-O-acetylharpagide (10). The structure elucidation of all the isolated compounds was based on their spectral data and chemical derivatization.
authors.affiliation: Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
authors.forename: N M
authors.initials: NM
authors.lastname: Al-Musayeib
authors.forename: F A
authors.initials: FA
authors.lastname: Abbas
authors.forename: M S
authors.initials: MS
authors.lastname: Ahmad
authors.forename: J S
authors.initials: JS
authors.lastname: Mossa
authors.forename: F S
authors.initials: FS
authors.lastname: El-Feraly
mesh_terms: D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004224:Diterpenes