All

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 D02 Organic Chemicals D009930 +
  D02.033 Alcohols D000438 +
   D02.033.100 Amino Alcohols D000605 +
    D02.033.100.291 Ethanolamines D004983 +
     D02.033.100.291.502 Norepinephrine D009638 
       D02.033.100.291.502.651 Normetanephrine D009647 
 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.063 Amino Alcohols D000605 +
    D02.092.063.480 Norepinephrine D009638 
      D02.092.063.480.651 Normetanephrine D009647 
 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.211 Biogenic Amines D001679 +
    D02.092.211.215 Biogenic Monoamines D015306 +
     D02.092.211.215.311 Catecholamines D002395 +
      D02.092.211.215.311.560 Norepinephrine D009638 
        D02.092.211.215.311.560.651 Normetanephrine D009647 
        D02.092.211.215.311.560.220 Droxidopa D015103 
 D02 Organic Chemicals D009930 +
  D02.092 Amines D000588 +
   D02.092.311 Catecholamines D002395 +
    D02.092.311.461 Epinephrine D004837 +
     D02.092.311.461.484 Norepinephrine D009638 
       D02.092.311.461.484.400 Nordefrin D008771 
       D02.092.311.461.484.220 Droxidopa D015103 
 D14 Neurotransmitters and Neurotransmitter Agents D018371 +
  D14.600 Neurotransmitters D009487 +
   D14.600.100 Biogenic Amine Neurotransmitters D018379 +
    D14.600.100.551 Norepinephrine D009638