Polymorphism of artemisinin from Artemisia annua

@article{Chan1997PolymorphismOA,
  title={Polymorphism of artemisinin from Artemisia annua},
  author={K. Chan and K. Yuen and H. Takayanagi and Sunil Janadasa and K. Peh},
  journal={Phytochemistry},
  year={1997},
  volume={46},
  pages={1209-1214}
}
Abstract X-ray crystallography studies have confirmed the discovery of a new polymorphic artemisinin crystal belonging to the triclinic space group, P1. The physicochemical properties of the new polymorph have been compared with those of the previously known orthorhombic P2 1 2 1 2 1 crystal by microscopic examination, density measurements, differential scanning calorimetry, infrared spectroscopy and dissolution studies. 
Purification of artemisinin from quercetin by anti-solvent crystallization
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