All

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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
   D03.383.312 Furans D005663 +
    D03.383.312.699 Psoralens D011564 +
     D03.383.312.699.500 Methoxsalen D008730 
 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.150 Benzopyrans D001578 +
    D03.438.150.446 Coumarins D003374 +
     D03.438.150.446.794 Psoralens D011564 +
      D03.438.150.446.794.500 Methoxsalen D008730 
 D03 Heterocyclic Compounds D006571 +
  D03.494 Heterocyclic Compounds, 3-Ring D006575 +
   D03.494.770 Psoralens D011564 +
    D03.494.770.500 Methoxsalen D008730