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Chemicals and Drugs
Heterocyclic Compounds
Alkaloids
+ 31
Heterocyclic Compounds, 2-Ring
+ 26
Heterocyclic Compounds, 1-Ring
+ 25
Heterocyclic Compounds, 3-Ring
+ 20
Heterocyclic Compounds with 4 or More Rings
+ 13
Pyrans
+ 11
Acids, Heterocyclic
+ 10
Heterocyclic Compounds, Bridged-Ring
+ 5
Heterocyclic Oxides
+ 3
Phytochemicals