FGROUP by class
Carbon Carbon skeleton Hydrocarbon ring N-heterocyclic O-heterocyclic S-heterocyclic Mixed-heterocyclic Oxygen Nitrogen Amine (F410000) Imine (F420000) Nitrile (F430000) Isocyanate (F437000) Nitro (F441000) Nitroso (F442000) Carboxamide (F450000) Amide (F450000) Amidine (F461000) Guanidine (F462000) Hydrazine (F471000) Hydrazone (F472000) Azo (F473000) Diazene (F473000) Diazonium (F474000) Azoxy (F475000) Azide (F476000) Hydrazide (F477000) Sulfur Phosphorus Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin