A new Dieis-Alder-type adduct, dorstenone (1), was isolated from Dorstenia barteri together with three known fiavonoids, 4,2',4'-trihydoxy-3'- prenylchalcone; 4,2',4'-trihydoxy-3,3'-diprenylchalcone; and 5,7,4'- trihydoxy-8-prenylflavone. The structure of 1 was elucidated using a combination of highfield NMR techniques, particularly, gradient-enhanced HMQC and HMBC.

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Persistent URL dx.doi.org/10.1021/np990109o
Journal Journal of Natural Products
Tsopmo, A, Tene, M. (Mathieu), Kamnaing, P. (Pierre), Ayafor, J.F. (Johnson F.), & Sterner, O. (Olov). (1999). A new Dieis-Alder-type adduct flavonoid from Dorstenia barteri. Journal of Natural Products, 62(10), 1432–1434. doi:10.1021/np990109o