Beckmann rearrangement products of methyl 3-oxo-tirucall-8, 24-dien-21-oate from Boswellia serrata gum and their anti-tumor activity

- Isolated 3-oxo-tirucall-8, 24-dien-21-oic acid from Boswellia serrata.
- Synthesized novel A-ring modified compounds (2-6).
- Tested in vitro inhibitory activities against five human tumor cell lines.
- Compounds 4 and 6 exhibited good anti-tumor activity against prostate cancer cell line.