A saponin, m.p.220-2300, [α]_D²⁵=+35.1°40°, has been obtained in about 9% yield from the Chinese drug, Pai 2'ou-wung, which is usually used for the treatment of fever and dysentery.During hydrolysis with 5% sulphuric acid it gives a crystalline sapogenin with a m.p.2840, [α]_D¹⁷=+35.1,and a molecular formula of C₂₇H₄₄O₄, and a crystalline acetyl derivative, C₂₇H₄₃O₄(CH₃CO), m.p.253°, is prepared.Since these saponin and sapogenin differ in properties from those described in literature, anemosaponin and anemosapogenin are provisionally assigned as their names.The sugar part has been confirmed to be glucose through the formation of osazone.A second principle, C₃₀H₅₂O₁₀ m.p.229-232°,has also been isolated from the ethereal extract of this drug.