乌奴龙胆中五个新的环烯醚萜甙

FIVE IRIDOIDAL GLYCOSIDES FROM GENTIANA URNULA

从藏药乌奴龙胆（ＧｅｎｔｉａｎａｕｒｎｕｌａＳｍｉｔｈ）（龙胆科）的全草中分离到５个新的环烯醚萜甙，命名为乌奴龙胆甙（ｇｅｎｔｉｏｕｍｏｓｉｄｅ）Ａ－Ｅ；它们的结构主要通过光谱分析得以确定。其中，乌奴龙胆Ａ－Ｃ是二聚环烯醚萜甙，而乌奴龙胆甙Ｄ和Ｅ为马钱素型的环烯醚萜甙，所有这些化合物的分子中都具有一个２，３－二羟基苯甲酰基或其衍生物的取代基。

Five new iridoidal glycosides,gentiournosides A-E were isolated from the whole herb of Gentiana urnula. Their structures were elucidated mainly by spectral methods.Among which gentiournosides A-Care bis-iridoidal glycosides while gentioumosides D and E are loganin type ones.It is noted that all the glycosidespossess a 2,3-dihydroxy benxoyl unit or its derivativein the molecule.