All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.901 Tricarboxylic Acids D014233 +
     D02.241.081.901.434 Citrates D002951 +
      D02.241.081.901.434.249 Citric Acid D019343