Fr. E (5.2 g) was loaded onto a Sephadex LH-20 column and eluted with CHCl3–MeOH (1:1) to yield five fractions (Fr. E1-Fr. E5).
Compounds 2 (3.6 mg), 6 (20 mg), 7 (10.7 mg), 13 (9.2 mg) and 25 (7.9 mg) were obtained from Fr. E2 by ODS CC, eluted with a MeOH–H2O gradient system (from 30:70 to 90:10), and were further purified by Sephadex LH-20 CC in MeOH.