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Organoarsenic compounds in which arsenic is bound onto phenyl.  
The structures of the arylarsenicals that are approved as animal-food additives are shown below.
4-Hydroxy-3-nitrophenylarsonic acid (3-NHPAA) and  p-arsanilic acid (p-ASA) are approved for poultry and swine. 4-Nitrophenylarsonic acid (4-NPAA) and  p-ureidophenylarsonic acid (p-UPAA) are approved only for controlling blackhead disease in turkeys.
There are some compounds, such as Clark-1, Clark-2 and Adamsite, which have been developed during the first World War as warfare chemicals. Some of their degradation products (e.g. diphenyl arsinic acid) can also been found in the environment close to former production or dump sites.


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