FGROUP by class
Carbon Carbon skeleton Hydrocarbon ring N-heterocyclic O-heterocyclic S-heterocyclic Mixed-heterocyclic Oxygen Hydroxy (F310000) Alcohol (F311000) Primary alcohol (F311100) Secondary alcohol (F311200) Tertiary alcohol (F311300) Nitrogen Sulfur Phosphorus Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin