(+)-Acuminatin exerts hepatoprotective activities, perhaps by serving as a potent antioxidant. (+)-trans-Acuminatin, and (+)-cis-acuminatin show weak activity against platelet aggregation with IC50 values of 108.5 and 90.02 uM, respectively. (+)-Acuminatin, and machilin G show dose-dependent potent inhibitory activities against PLCgamma1 in vitro with IC50 values ranging from 8.8 to 26.0 microM, the inhibition of PLCgamma1 may be an important mechanism for an antiproliferative effect on the human cancer cells, therefore, these inhibitors may be utilized as cancer chemotherapeutic and chemopreventive agents.