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 Medical Concepts
  Chemicals and Drugs
 Heterocyclic Compounds
 Heterocyclic Compounds, 1-Ring
 Azoles
 Pyrroles
 Tetrapyrroles
 Porphyrins
 Metalloporphyrins
 Chlorophyll
 Bacteriochlorophylls
 Chlorophyllides
 Protochlorophyllide

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