Acid-catalyzed isomerization in the peptide part of ergot alkaloids.

@article{Ott1966AcidcatalyzedII,
  title={Acid-catalyzed isomerization in the peptide part of ergot alkaloids.},
  author={Harald Ott and Anton Hofmann and Andreas Frey},
  journal={Journal of the American Chemical Society},
  year={1966},
  volume={88 6},
  pages={1251-6}
}