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Labdane diterpenes from Otostegia fruticosa
N M Al-Musayeib1, F A Abbas, M S Ahmad
1Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
Phytochemistry
|October 3, 2000
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.