Hyperisampsins N and O, two new benzoylated phloroglucinol derivatives from Hypericum sampsonii

Hyperisampsins N and O (1 and 2), two new benzoylated phloroglucinol derivatives bearing a homoadamantyl framework, were isolated from the aerial parts of Hypericum sampsonii. Compound 2 exhibited significant cytotoxic activity toward HL-60 cell.