Tonantzitlolone and other Diterpenes from Stillingia sanguinolenta

Abstract Cembrene A (1), two novel diterpenes 2 and 3 with the rare flexibilane skeleton, two new pimaranes 4 and 5, sevenkauranes 6–12 (9 and 12 new), three known atisanes 13–15, a new trachylobane 16, and the new pentacyclic diterpene sanguinolane 17 with a novel skeleton were obtained from Stillingia sanguinolenta. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)