FGROUP by class
Carbon Carbon skeleton Hydrocarbon ring N-heterocyclic O-heterocyclic S-heterocyclic Mixed-heterocyclic Oxygen Hydroxy (F310000) Alcohol (F311000) Hemiacetal (F312100) Hemiketal (F312200) Enol (F313000) Phenol (F314000) Peroxide (F315000) Nitrogen Sulfur Phosphorus Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin