SEARCH Articles Figures Tables Fused atoms Fused heterocyclic Heterocycle oxygen Heterocycles containing Heterocycles containing One Sulphur Atom Heterocycles containing one oxygen atom Heterocycles fused Heterocycles oxygenation Heterocyclic oxygen One Oxygen Atom One Sulphur Atom Oxygen atom Oxygen atomic Oxygen containing Oxygen sulphur Oxygen-containing heterocyclics Sulphur Heterocycles Sulphur atoms Sulphur-containing heterocycles