were separated fromF4 by using a reverse phase column eluted with methanol–water (10:1 v/v). Compound 11 (11.0 mg) was purified from F7 on a silica gel column using a mobile phase of hexane–ethyl acetate (1:1 v/v).
were separated fromF4 byusing a reverse phase column eluted with methanol–water(10:1 v/v). Compound 11 (11.0 mg) was purified from F7 on asilica gel column using a mobile phase of hexane–ethyl acetate(1:1 v/v).