All

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 D02 Organic Chemicals D009930 +
  D02.640 Nitro Compounds D009574 +
   D02.640.743 Nitrophenols D009596 +
    D02.640.743.304 Dinitrophenols D004140 +
      D02.640.743.304.250 2,4-Dinitrophenol D019297 
 D02 Organic Chemicals D009930 +
  D02.755 Phenols D010636 +
   D02.755.566 Nitrophenols D009596 +
    D02.755.566.304 Dinitrophenols D004140 +
      D02.755.566.304.500 2,4-Dinitrophenol D019297