Semi-synthesis of triterpene A-ring derivatives from oleanolic and maslinic acids. Part II. Theoretical and experimental 13C chemical shifts

1. García-Granados, A.
2. Dueñas, J.
3. Melguizo, E.
4. Moliz, J.N.
5. Parra, A.
6. Pérez, F.L.
7. Dobado, J.A.
8. Molina, J.