SEARCH Articles Figures Tables Heterocycle oxygen Heterocycles containing Heterocycles containing one oxygen atom Heterocycles oxygenation Heterocycles six-membered ring Heterocyclic 5- membered ring Heterocyclic oxygen Heterocyclics six-membered One Oxygen Atom Oxygen atom Oxygen atomic Oxygen containing Oxygen ring Oxygen-containing heterocyclics Ring oxygenation Rings containing Oxygen Rings six-member Six-Membered Heterocycled Six-membered heterocycles Six-membered heterocyclic rings