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) Primary alcohol phosphate ester (F651100) Secondary alcohol phosphate ester (F651200) Tertiary alcohol phosphate ester (F651300) Hemiacetal phosphate ester (F651400) Hemiketal phosphate ester (F651500) Enol phosphate ester (F652000) Acetylene phosphate ester (F653000) Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin