One portion (1.4 g) of the condensation residue of the lower brown layer was subjected to three successive CCs (cellulose, first column eluted with EtOAc, EtOAc/iPrOH mixtures, second and third columns eluted with cyclohexane/EtOAc and EtOAc/MeOH mixtures), and finally the mixture was separated using preparative TLC (silica plates, first development with EtOAc/MeOH/HOAc, 50:49.5:0.5, second development with EtOAc/MeOH/HOAc, 60:39:1). After extraction of the zones with MeOH, 4 (44.6 mg, also containing silica) was obtained.