Guaianolides and germacranolides from Stevia grisebachiana
摘要:
The aerial parts of Stevia grisebachiana afforded, in addition to estafietin, 11-alpha-H,13-dihydroestafietin, dehydroleucodin, 10-epi-8-deoxycumambrin, hanphyllin and loliolide, seven new guaianolides and one new germacranolide. The structure of the latter, 4-epitansanin, was confirmed by X-ray analysis.