Fraction 2 eluted with PEEtOAc (2:1) and was further fractionated by reversed-phase C18 silica column chromatography eluting with a stepwise gradient of 10–100% MeOH in H2O to get 8 sub-fractions (Fr.2.1–2.8). Fraction 2.3 was further purified by Sephadex LH-20 eluting with MeOH to obtain 3 (20.0 mg) and 4 (8.2 mg).