J Asian Nat Prod Res. 2002 Sep; 4(3): 175-8.

New thiophenes from Echinops grijisii.

Liu Y, Ye M, Guo HZ, Zhao YY, Guo DA.

The State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China.

A new thiophene-echinoynethiophene A (11), four new natural products, namely 5,5"-dichloro-alpha-terthiophene (1), 5-chloro-alpha-terthiophene (2), 5-acetyl alpha-terthiophene (3) and 5-carboxyl bithiophene (12), together with seven known thiophenes were isolated and purified from ethanol extract of roots of Echinops grijisii Hance. Their structures were identified on the basis of spectral data.