All

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 D03 Heterocyclic Compounds D006571 +
  D03.438 Heterocyclic Compounds, 2-Ring D006574 +
   D03.438.473 Indoles D007211 +
    D03.438.473.914 Tryptamines D014363 +
     D03.438.473.914.481 Melatonin D008550 
 D06 Hormones, Hormone Substitutes, and Hormone Antagonists D006730 +
  D06.472 Hormones D006728 +
   D06.472.506 Melatonin D008550