All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.038 Acetic Acids D000088 +
     D02.241.081.038.725 Phosphonoacetic Acid D010746 +
      D02.241.081.038.725.250 Foscarnet D017245 
 D02 Organic Chemicals D009930 +
  D02.705 Organophosphorus Compounds D009943 +
   D02.705.639 Phosphonic Acids D010745 +
    D02.705.639.590 Phosphonoacetic Acid D010746 +
     D02.705.639.590.500 Foscarnet D017245