从中药知母（ＡｎｅｍａｒｈｅｎａａｓｐｈｏｄｅｌｏｉｄｅｓＢｇｅ．）中分离出一种新的呋甾皂苷，用化学和光谱方法确定其结构为：（２５Ｓ）２６ＯβＤ吡喃葡萄糖基５β呋甾２０（２２）烯２β，３β２６三醇３ＯβＤ吡喃葡萄糖基（１→２）βＤ吡喃半乳糖苷，命名为知母皂苷Ｄ． A new furostanin was isolated from Anemarhenaasphodeloides Bge. The structure was determined by chemical and spectroscopic methods: (25S) 26-O-β-D-glucopyranosyl-5β-furoxan ——20(22)ene2β,3β26triol3OβD-glucopyranosyl (1→2)βD galactopyranoside, named as timosaponin D.