All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.081 Acids, Acyclic D000144 +
    D02.241.081.337 Dicarboxylic Acids D003998 +
     D02.241.081.337.502 Maleates D008298 +
      D02.241.081.337.502.524 Maleimides D008301 +
        D02.241.081.337.502.524.418 Ethylmaleimide D005033 
 D02 Organic Chemicals D009930 +
  D02.478 Imides D007094 +
   D02.478.440 Maleimides D008301 +
     D02.478.440.418 Ethylmaleimide D005033 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.757 Pyrroles D011758 +
    D03.383.757.399 Maleimides D008301 +
      D03.383.757.399.418 Ethylmaleimide D005033