All

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 D02 Organic Chemicals D009930 +
  D02.241 Carboxylic Acids D002264 +
   D02.241.223 Acids, Carbocyclic D000146 +
    D02.241.223.601 Phenylacetates D010648 +
     D02.241.223.601.600 Methylphenidate D008774 
 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.460 Methylphenidate D008774