FANFT, a potent nitrofuran derivative tumor initiator. It causes bladder tumors in all animals studied and is mutagenic to many bacteria.
The European Union has banned the use of Nitrofurans in food-producing animals. In the 2000s, a number of meat imports were destroyed after nitrofurans were found, including chicken imported from Portugal, and chicken imported from Thailand and Brazil.
^Chu, Pak-Sin; Lopez, Mayda I; Abraham, Ann; El Said, Kathleen R; Plakas, Steven M (2008). "Residue Depletion of Nitrofuran Drugs and Their Tissue-Bound Metabolites in Channel Catfish (Ictalurus punctatus) after Oral Dosing". Journal of Agricultural and Food Chemistry. 56 (17): 8030–8034. doi:10.1021/jf801398p. PMID18698789.