FGROUP by class
Carbon Carbon skeleton Hydrocarbon ring N-heterocyclic O-heterocyclic S-heterocyclic Mixed-heterocyclic Oxygen Nitrogen Sulfur Phosphorus Phosphate ester (F640000) Monophosphate (F641000) Alcohol phosphate ester (F651000) Methyl phosphate (F651001) Enol phosphate ester (F652000) Primary enol phosphate ester (F652100) Secondary enol phosphate ester (F652200) Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin