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 +
      D02.455.849.131.123 beta Carotene D019207 
      D02.455.849.131.912 zeta Carotene D024321 
      D02.455.849.131.868 Xanthophylls D024341 +
      D02.455.849.131.309 Norisoprenoids D045792 
 D11 Growth Substances, Pigments, and Vitamins D006134 +
  D11.557 Pigments D010860 +
   D11.557.261 Carotenoids D002338 +
     D11.557.261.700 Retinoids D012176 +
     D11.557.261.050 beta Carotene D019207 
     D11.557.261.925 zeta Carotene D024321 
     D11.557.261.887 Xanthophylls D024341 +