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 Medical Concepts
  Chemicals and Drugs
 Heterocyclic Compounds
 Acids, Heterocyclic
 Alkaloids
 1-Deoxynojirimycin
 Aconitine
 Acridones
 Amaryllidaceae Alkaloids
 Anabasine
 Arecoline
 Benzophenanthridines
 Benzylisoquinolines
 Betalains
 Camptothecin
 Cinchona Alkaloids
 Colchicine
 Dihydro-beta-Erythroidine
 Emetine
 Ergot Alkaloids
 Harringtonines
 Indole Alkaloids
 Lobeline
 Mescaline
 Muscarine
 Opiate Alkaloids
 Pilocarpine
 Pyrrolizidine Alkaloids
 Ryanodine
 Salsoline Alkaloids
 Solanaceous Alkaloids
 Sparteine
 Swainsonine
 Tropanes
 Veratrum Alkaloids
 Xanthines
 Heterocyclic Compounds, 1-Ring
 Heterocyclic Compounds, 2-Ring
 Heterocyclic Compounds, 3-Ring
 Heterocyclic Compounds with 4 or More Rings
 Heterocyclic Compounds, Bridged-Ring
 Heterocyclic Oxides
 Pyrans

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