FGROUP by class
Carbon Carbon skeleton Hydrocarbon ring N-heterocyclic Dicyclic 6+6-membered Fully aromatic Quinoline (F222641) Isoquinoline (F222642) Pterin (F222650) O-heterocyclic S-heterocyclic Mixed-heterocyclic Oxygen Nitrogen Sulfur Phosphorus Halogen Boron Magnesium Silicon Iron Cobalt Asenic Selenium Tin