Nifursol- 13 C 6 is the 13 C 6 labeled Nifursol. Nifursol is a potent and orally active veterinary antibiotic for the prevention of histomoniasis. Nifursol rapidly metabolizes to form the metabolic marker 3,5-dinitrosalicyclic acid hydrazide (DNSAH) which can persist for a long time. Nifursol is widely used for the research of Escherichia Gastroenteropathy in poultry, fowl and aquatic animal.