All

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 D02 Organic Chemicals D009930 +
  D02.172 Azo Compounds D001391 +
   D02.172.045 p-Azobenzenearsonate D010132 
 D02 Organic Chemicals D009930 +
  D02.691 Organometallic Compounds D009942 +
   D02.691.088 Arsenicals D001152 +
    D02.691.088.060 p-Azobenzenearsonate D010132 
 D24 Immunologic and Biological Factors D007151 +
  D24.611 Immunologic Factors D007155 +
   D24.611.216 Antigens D000941 +
    D24.611.216.550 Epitopes D000939 +
     D24.611.216.550.480 Haptens D006241 +
      D24.611.216.550.480.097 p-Azobenzenearsonate D010132