All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.589 Lactams D007769 +
    D02.065.589.875 Penicillins D010406 +
     D02.065.589.875.750 Penicillin G D010400 +
      D02.065.589.875.750.695 Penicillin G, Procaine D010402 
 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.223 Acids, Carbocyclic D000146 +
    D02.241.223.100 Benzoic Acids D020185 +
     D02.241.223.100.054 Aminobenzoic Acids D000610 +
      D02.241.223.100.054.055 4-Aminobenzoic Acid D010129 +
       D02.241.223.100.054.055.665 Procaine D011343 +
        D02.241.223.100.054.055.665.666 Penicillin G, Procaine D010402 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.260 Bicyclo Compounds, Heterocyclic D019086 +
    D03.438.260.825 Penicillins D010406 +
     D03.438.260.825.750 Penicillin G D010400 +
      D03.438.260.825.750.695 Penicillin G, Procaine D010402 
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.084 Bicyclo Compounds, Heterocyclic D019086 +
    D03.605.084.737 Penicillins D010406 +
     D03.605.084.737.750 Penicillin G D010400 +
      D03.605.084.737.750.695 Penicillin G, Procaine D010402