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) Orthophosphate (F641000) Diphosphate (F642000) Pyrophosphate (F642000) Triphosphate (F643000) Tetraphosphate (F644000) Phosphate phosphate ester (F649000) Alcohol phosphate ester (F651000) Phenol phosphate ester (F654000) Carboxylate phosphate ester (F655000) Sulfate phosphate ester (F660100) Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin