Derivatives of grindelic acid: From a non-active natural diterpene to synthetic antitumor derivatives

1. Reta, G.F.
2. Chiaramello, A.I.
3. García, C.
4. León, L.G.
5. Martín, V.S.
6. Padrón, J.M.
7. Tonn, C.E.
8. Donadel, O.J.