Abstract
The aerial parts of Stevia sarensis afforded several known germacranolides, guaianolides and labdane derivatives while S. samaipatensis gave four new guaianolides, one being a fulvene and two new labdane derivatives. From S. yacomensis four new longipinene derivatives and a guaianolide were isolated. The aerial parts of S. polyphylla afforded in addition to known compounds nine further guaianolides and the first 12.8β-germacrolide. Structures were elucidated by high field NMR spectroscopy and a few chemical transformations.
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