al-Yahya M A, el-Sayed A M, Mossa J S, Kozlowski J F, Antoun M D, Ferin M, Baird W M, Cassady J M
Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
J Nat Prod. 1988 May-Jun;51(3):621-4. doi: 10.1021/np50057a038.