All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.069 Acrylates D000179 +
     D02.241.081.069.920 Urocanic Acid D014560 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.374 Imidazoles D007093 +
    D03.383.374.960 Urocanic Acid D014560