Three New Sesquiterpenoids from Echinops ritro L.

[摘要]：From the whole plants of E. ritro L., the three new sesquiterpenoids (3 alpha,4 alpha,6 alpha)-3,13-dihydroxyguaia-7(11),10(14)-dieno-12,6-lactone (1), (3 alpha,4 alpha,6 alpha,11 beta)-3-hydroxyguai-1(10)-eno-12,6-lactone (2), and (11 alpha)-11,13-dihydroarglanilic acid methyl ester (=(4 beta,6 alpha,11 alpha)-4,6-dihydroxy-1-oxoeudesm-2-en-12-oic acid methyl ester; 3), together with eight known sesquiterpenoids, were isolated. Their structures were elucidated through analysis of spectroscopic data including extensive 2D-NMR.

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