Roxarsone

4-Hydroxy-3-nitrobenzenearsonic acid is an organic compound that is widely used as a food additive for chickens. The molecule is a derivative of phenylarsonic acid (C6H5As(O)(OH)2). This organoarsenic compound, usually under the tradename Roxarsone, has attracted attention as a source of arsenic contamination of the food chain. Approximately 1 million kilograms of this compound was produced in 2006 in the US.[1] This compound was first reported in a 1923 British patent which describes the nitration and diazotization of arsanilic acid.[2