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 D02 Organic Chemicals D009930 +
  D02.065 Amides D000577 +
   D02.065.589 Lactams D007769 +
    D02.065.589.260 Cephalosporins D002511 +
     D02.065.589.260.250 Cephamycins D002513 +
      D02.065.589.260.250.177 Cefmetazole D015311