Labdane diterpenes from Otostegia fruticosa.
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.
Al-Musayeib
N M
NM
Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
Abbas
F A
FA
Ahmad
M S
MS
Mossa
J S
JS
El-Feraly
F S
FS
D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D013056:Spectrophotometry, Ultraviolet
D004224:Diterpenes