The dried aerial part (900 g) of B. lupulina was extracted with hot MeOH. After removal of the solvent by evaporation, the residue (100 g) was defatted with Et2O. The aqueous layer was subjected to a column of highly porous copolymer of styrene and divinylbenzene and eluted with H2O, MeOH and Me2CO, successively. The fraction eluted with MeOH (29.0 g) was subjected to a column of silica gel (systems I, II and III, respectively) affording five fractions. Fraction 2 (7.4 g) was applied to a RP-18 column using system IV to provide six fractions, together with compound 4 (5.1 g). Fractions 2–5 were purified by prep. HPLC–ODS (system VI) to afford compounds 8 (43 mg) and 12 (27 mg). Fraction 3 (8.4 g) was subjected to a column of RP-18 (system IV) to give eight fractions, along with compounds 2 (2.6 g) and 10 (596 mg). Fractions 3-1 and 3-2 were further purified by prep. HPLC-ODS (system V) to provide compound 3 (398 mg). Fraction 3-8 was purified by prep. HPLC-ODS (system VI) to afford compound 16 (92 mg). Fraction 4 (8.2 g) was applied to a RP-18 column (system VII) to afford fifteen fractions