The 40% fraction was subjected to open column chromatography on COSMOSIL 75018 adsorbent eluting with only water to afford 1 (12.5 mg) and 2 (4.0 mg) Compound 4 precipitated on putting the 10% fraction in MeOH, and was purified by HPLC using a SIELC Primesep P column (10 x 250 mm, 5 m), eluting with isochratic aqueous 0.1% formic acid.