SEARCH Articles Figures Tables Contain Nitrogen Containers nitrogen Heterocycle formation Heterocycle oxygen Heterocycles containing Heterocycles oxygenation Heterocyclic nitrogen Heterocyclic oxygen Nitrogen and Oxygen Heterocycles Nitrogen formation and Nitrogen heterocycles, formation Nitrogen oxygen and Nitrogen, formation Nitrogen-containing Nitrogen-containing heterocyclics Of nitrogen-containing Of nitrogen-containing heterocycles Oxygen containing Oxygen heterocycles, formation Oxygen, formation Oxygen-containing heterocyclics Oxygen-nitrogen heterocycles Oxygenates formation