Indoles+ 27
Quinolines+ 16
Benzimidazoles+ 14
Isoquinolines+ 11
Benzopyrans+ 9
Purines+ 8
Benzofurans+ 7
Benzothiadiazines+ 7
Benzazepines+ 6
Isoindoles+ 5
Benzothiazoles+ 4
Benzoxazoles+ 4
Quinazolines+ 4
Quinoxalines+ 4
Bicyclo Compounds, Heterocyclic+ 3
Pteridines+ 3
Quinolizines+ 3
Benzodioxoles+ 2
Indazoles+ 2
Benzothiepins+ 1
Indolizines+ 1
Naphthyridines+ 1
Pyrrolizidine Alkaloids+ 1
Thienopyridines+ 1
BenzoxazinesBenzoxepins