All

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 D03 Heterocyclic Compounds D006571 +
  D03.132 Alkaloids D000470 +
   D03.132.327 Ergot Alkaloids D004876 +
    D03.132.327.412 Ergotamines D004879 +
     D03.132.327.412.225 Dihydroergotamine D004087 
 D03 Heterocyclic Compounds D006571 +
  D03.549 Heterocyclic Compounds with 4 or More Rings D006576 +
   D03.549.562 Ergotamines D004879 +
    D03.549.562.300 Dihydroergotamine D004087