Buddlejasaponins I-IV, four new oleanane-triterpene saponins from the aerial parts of Buddleja japonica Hemsl.

Four new oleanane-type triterpene saponins, named buddlejasaponins I (1), II (2), III (3) and IV (4) were isolated from the aerial parts of Buddleja japonica HEMSL., together with a known saponin saikosaponin a (5). Their structures were elucidated on the basis of the chemical and spectroscopic studies.