Helikaurolides A-D with a Diterpene-Sesquiterpene Skeleton from Supercritical Fluid Extracts of Helianthus annuus L. var. Arianna

1. Torres, A.
2. Molinillo, J.M.G.
3. Varela, R.M.
4. Casas, L.
5. Mantell, C.
6. Martínez De La Ossa, E.J.
7. MacÍas, F.A.