A New Ursene Type Triterpenoid from Crepis napifera

A new triterpenoid, urs-20-en-3β-acetoxy-22α-ol, and three known compounds 3β- acetoxy-amyrin, 3β-acetoxy-lupeol, lupeol were isolated from the leaves of Crepis napifera (Franch.) Babc. Their structures were determined by means of spectroscopic studies.

绿茎还阳参化学成分的研究

采用柱层析和重结晶从药用植物绿茎还阳参(Crepis lignea)丙酮提取物中分离得到7个单体化合物,并根据化合物的理化性质和波谱分析,分别鉴定为:3β-acetoxyurs-13(18)-ene(1),lupeol acetate(2),4-hydroxy-3-methoxycinnamaldehyde(3),(Z)-2-ethylidene-3-methylsuccinic acid(4),olean-12-ene-11α-methoxy-3β-acetate(5),α-amyrin acetate(6)和lupeol-9(11)en-3β-acetate(7)。上述化合物均为首次从绿茎还阳参中分离得到。