All

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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.589 Lactams D007769 +
    D02.065.589.225 Carbapenems D015780 +
     D02.065.589.225.300 Thienamycins D013845 +
       D02.065.589.225.300.500 Imipenem D015378