Indole alkaloids from the leaves of Philippine Alstonia scholaris.

@article{Macabeo2005IndoleAF,
  title={Indole alkaloids from the leaves of Philippine Alstonia scholaris.},
  author={Allan Patrick G Macabeo and Karsten Krohn and Dietmar Gehle and Roger W. Read and Joseph J Brophy and Geoffrey A. Cordell and Scott G Franzblau and Alicia M. Aguinaldo},
  journal={Phytochemistry},
  year={2005},
  volume={66 10},
  pages={1158-62}
}
The first seco-uleine alkaloids, manilamine (1) (18-hydroxy-19,20-dehydro-7,21-seco-uleine) and N4-methyl angustilobine B (2), were isolated from the (pH 5) alkaloid extract of Philippine Alstonia scholaris leaves together with the known indole alkaloids 19,20-(E)-vallesamine (3), angustilobine B N4-oxide (4), 20(S)-tubotaiwine (5), and 6,7-seco-angustilobine B (6). The structure of the alkaloids was established from MS and NMR experiments. 

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