The latex was dissolved in methanol and applied directly to preparative thin layer chromatography (PTLC) plates over silica gel G6 F254 (Merck; 20 cm × 20 cm; 0.50 mm thickness). A solvent system of EtOAc/ MeOH/H2O (77:13:10) was used for isolation. PTLC plates with 0.25 mm thickness were used to further purify the compounds.