Six-Membered Heterocyclic Compounds with a Single Nitrogen Atom in the Ring to Which Are Fused Two or More Carbocyclic Ring Systems, and Six-Membered Ring Compounds Where the Hetero-Atom Is Phosphorus, Arsenic, Antimony or Bismuth: Alkaloids Containing a
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Six-Membered Heterocyclic Compounds with a Single Nitrogen Atom in the Ring to Which Are Fused Two or More Carbocyclic Ring Systems, and Six-Membered Ring Compounds Where the Hetero-Atom Is Phosphorus, Arsenic, Antimony or Bismuth: Alkaloids Containing a
