Sesquiterpenoids from roots of Taraxacum laevigatum and Taraxacum disseminatum

Chromatographic separation of ethanolic root extracts of Taraxacum laevigatum and Taraxacum disseminatum afforded a total of eight germacrane- and eudesmane-type sesquiterpenoids, including new compounds, 1 beta,3 beta,6 alpha-trihydroxy-4 alpha(15)-dihydrocostic acid methyl ester and its 1-O-beta-glucopyranoside. Their structures were established by spectroscopic analyses. In addition, the structure of 4 alpha(15),11 beta(13)-tetrahydroridentin B-1-O-beta-glucopyranoside was elucidated by extensive NMR studies. (C) 2000 Elsevier Science Ltd. All rights reserved.