生物活性: 20(S),24(S)-Dihydroxydammar-25-en-3-one (compound 19) is a kind of triterpene. 20(S),24(S)-Dihydroxydammar-25-en-3-one can be isolated from the floral spikes of Betula platyphylla var. 20(S),24(S)-Dihydroxydammar-25-en-3-one has cytotoxicity against Human Cancer Cell Lines.