Cassane diterpenoids from stem bark of Erythrophleum suaveolens [(Guill. et Perr.), Brenan]

- Structural elucidation of four new cassane diterpenoids.
- Two types of cassane diterpenoids alkaloid (amide and amine).
- Predominance of cassane diterpenoids alkaloids functionalized to position 7.
- The carbons 3 and 6 are the most often oxidized alcohol positions.
- Aromatic cassane diterpenoids are unusual in the genus.