From the mature leaves of Agave rigida Miller var. elongata Baker (Amarylliaceae), hecogenin (I) and its α,β-unsaturated keto analogue,9(11)-dehydrohecogenin (II) were isolated. 由白葉瓊麻(Agave rigida Miller var. elongate Baker)之成熟葉子分離出Hecogenin 及其α,β-不飽和酮基衍生物9-(II)-dehydrohecogenin