Abstract
The leaf extract of Biota orientalis showed potent PAF receptor binding antagonistic activity in our previous screening studies on 234 Korean medicinal plants using rabbit platelet receptor binding tests. The activity-guided purification of the plant extract resulted in the isolation of six compounds, including two active substances. The chemical structures of the compounds isolated were established by chemical and spectrometric analyses as dotriacontane, totarol, 8 beta-hydroxy-3-oxopimar-15-ene, cedrol (IC50 = 1.3 x 10(-5) M), pinusolide (IC50 = 2.52 x 10(-7) M), and 5-hydroxy-7,4'-dimethoxyflavone.
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