Chemical investigation of Drypetes littoralis yielded three new tricyclic d
iterpenes, drypetenones A, B, and C (1-3), and one new xanthone (4). Spectr
al analyses and chemical correlations established the structures as 10S-12-
3-methylpodocarpa-1,5,8, 11,13-pentaene-3,7-dione (3), and 1-hydroxy-7-hydr
oxymethyl-6-methoxyxanthone (4). Complete C-13 NMR assignment of boehmenan
D (5) is also made.