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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.621 Piperidines D010880 +
    D03.383.621.265 Fentanyl D005283 +
      D03.383.621.265.100 Alfentanil D015760 
      D03.383.621.265.900 Sufentanil D017409