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Staminolactones A and B and norstaminol A: three highly oxygenated staminane-type diterpenes from Orthosiphon
P Stampoulis1, Y Tezuka, A H Banskota
1Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Japan.
Organic Letters
|May 29, 2000
Abstract:
[formula: see text] Staminolactones A (1) and B (2) and norstaminol A (3), three highly oxygenated staminane-type diterpenes having mild cytotoxic activities against highly liver-metastatic colon 26-L5 carcinoma cells, were isolated from the aerial part of the Vietnamese medicinal plant Orthosiphon stamineus (Lamiaceae). Their structures were elucidated on the basis of the extensive spectral analyses.