All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.849 Terpenes D013729 +
    D02.455.849.131 Carotenoids D002338 +
     D02.455.849.131.495 Retinoids D012176 +
       D02.455.849.131.495.250 Etretinate D005050 
       D02.455.849.131.495.690 Retinaldehyde D012172 
       D02.455.849.131.495.818 Vitamin A D014801 
       D02.455.849.131.495.325 Isotretinoin D015474 
       D02.455.849.131.495.050 Acitretin D017255 
       D02.455.849.131.495.270 Fenretinide D017313 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.557 Pigments D010860 +
   D11.557.261 Carotenoids D002338 +
    D11.557.261.700 Retinoids D012176 +
      D11.557.261.700.250 Etretinate D005050 
      D11.557.261.700.690 Retinaldehyde D012172 
      D11.557.261.700.780 Tretinoin D014212 
      D11.557.261.700.860 Vitamin A D014801 
      D11.557.261.700.325 Isotretinoin D015474 
      D11.557.261.700.050 Acitretin D017255 
      D11.557.261.700.270 Fenretinide D017313