Biosynthesis of the protoberberine alkaloid jatrorrhizine

@article{Rueffer1983BiosynthesisOT,
  title={Biosynthesis of the protoberberine alkaloid jatrorrhizine},
  author={M. Rueffer and O. Ekundayo and N. Nagakura and M. Zenk},
  journal={Tetrahedron Letters},
  year={1983},
  volume={24},
  pages={2643-2644}
}
Feeding experiments with distant single or doubly labelled precursors show that the methylene dioxy group of berberine is opened in the formation of jatrorrhizine. 
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