Alstonic acids A and B, unusual 2,3-secofernane triterpenoids from Alstonia scholaris.

@article{Wang2009AlstonicAA,
  title={Alstonic acids A and B, unusual 2,3-secofernane triterpenoids from Alstonia scholaris.},
  author={Fei Wang and Fu-cai Ren and Jikai Liu},
  journal={Phytochemistry},
  year={2009},
  volume={70 5},
  pages={650-4}
}
2,3-Secofernane triterpenoids, alstonic acids A (1) and B (2), were isolated from the leaves of Alstonia scholaris together with an indole alkaloid, N(1)-methoxymethyl picrinine (3). Their structures were established from MS and NMR spectroscopic analyses and confirmed by single crystal X-ray diffraction analysis. 

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