Cynaropicrin from artichoke leaf extract is a sesquiterpene lactone with a bitter taste

Sesquiterpene lactones from Saussurea alata.
Nat Prod Res. 2007 Mar; Research Centre of Siyuan Natural Pharmacy and Bio-toxicity, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
Two new guaianolides together with six known guaianolides, 8-hydroxyzaluzanin C, austricin, chlorojanerin, cynaropicrin, chlorohyssopifolin E and chlorohyssopifolin A were isolated from the aerial parts of Saussurea alata.

Studies on chemical constituents of Acroptilon repens
Zhongguo Zhong Yao Za Zhi. 2006 Nov; College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China.
To investigate the chemical constituents of Acroptilon repens. The ethanol extract of A. repens was isolated and purified by means of chromatography. These compounds were identified by their spectral data. 11 compounds were isolated and identified as 2alpha, 9beta-dihydroxy-dehydrocostus lactone , cynaropicrin , apigenin, stigmasterol, 4' -hydroxywogonin, ethyl caffeate, p-methoxy-cinnamic acid, luteolin, daucosterol, apigenin-7-O-beta-D-glucoside, syringin.