All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.160 Butyric Acids D002088 +
     D02.241.081.160.050 Aminobutyric Acids D000613 +
      D02.241.081.160.050.055 Aminoisobutyric Acids D000621 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.070 Amino Acids, Branched-Chain D000597 +
    D12.125.070.075 Aminoisobutyric Acids D000621 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.190 Aminobutyric Acids D000613 +
    D12.125.190.055 Aminoisobutyric Acids D000621