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Keywords:

  • fexinidazole;
  • carbon-14;
  • deuterium;
  • internal standard;
  • LC-MS

The preparation of deuterium labeled fexinidazole, a 5-nitroimidazole drug candidate for the treatment of Human African Trypanosomiasis, and its two main metabolites (fexinidazole sulfoxide and fexinidazole sulfone) for use as internal standards for liquid chromatography-mass spectrometry are reported. Additionally, the synthesis of a 14 C-labeled version of fexinidazole for absorption, distribution, metabolism, and excretion studies is also described via a five-step procedure starting from commercially available potassium [14 C]cyanide. Copyright © 2011 John Wiley & Sons, Ltd.