Stemocurtisine, the first pyrido[1,2-a]azapine Stemona alkaloid.

  title={Stemocurtisine, the first pyrido[1,2-a]azapine Stemona alkaloid.},
  author={Pitchaya Mungkornasawakul and Stephen G. Pyne and Araya Jatisatienr and Damrat Supyen and Wilford Lie and Alison Thavary Ung and Brian W. Skelton and Allan H. White},
  journal={Journal of natural products},
  volume={66 7},
A new pentacyclic stemona alkaloid, stemocurtisine (2), with a novel pyrido[1,2-a]azapine A,B-ring system, has been isolated from a root extract of Stemona curtisii. The structure and relative stereochemistry was determined by spectral data interpretation and X-ray crystallography. 

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(CH) 3.07 (quin, 6.5) H-10, H-10a, Me (18) 12 147.2 (C) H-10, H-11