All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.589 Lactams D007769 +
    D02.065.589.875 Penicillins D010406 +
     D02.065.589.875.562 Nafcillin D009254 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.260 Bicyclo Compounds, Heterocyclic D019086 +
    D03.438.260.825 Penicillins D010406 +
     D03.438.260.825.562 Nafcillin D009254 
 D03 Heterocyclic Compounds D006571 +
  D03.605 Heterocyclic Compounds, Bridged-Ring D006572 +
   D03.605.084 Bicyclo Compounds, Heterocyclic D019086 +
    D03.605.084.737 Penicillins D010406 +
     D03.605.084.737.562 Nafcillin D009254