[Annonacins and Annonastatin from Annona squamosa].

Annonacin ( 1), annonacin A ( 6), and annonastatin ( 7) were isolated from the seeds of ANNONA SQUAMOSA L. (Annonaceae). Compounds 6 and 7 are described for the first time. The relative configuration of the tetrahydrofuran core of 1 (with hitherto unknown configuration), as well as those of compounds 6, and 7 were established by (13)C- and (1)H-NMR spectroscopy using data of the derivatives 8- 11.