SEARCH Articles Figures Tables Contain Nitrogen Containers nitrogen Fragmentation nitrogen Fragmentation of heterocycles From heterocycles Fused heterocyclic Fused nitrogen heterocycles Heterocycles containing Heterocycles fused Heterocycles pyrazines Heterocyclic nitrogen Nitrogen heterocycles, synthesis Nitrogen synthesis Nitrogen-containing Nitrogen-containing heterocycle synthesis Nitrogen-containing heterocyclics Of nitrogen-containing Of nitrogen-containing heterocycles Of pyrazine Of pyrazines Of quinoxalines Pyrazines quinoxalines Quinoxaline synthesis Quinoxalines synthesis Quinoxalines, synthesis from Synthesis fragmentation Synthesis of Quinoxalines Synthesis of quinoxaline