SEARCH Articles Figures Tables Benzene fused Benzene rings Benzene rings Benzenes Benzenic ring Fused heterocyclic Fused rings Fused six-membered rings Heterocycles fused Heterocycles six-membered ring Heterocyclic 5- membered ring Heterocyclics six-membered Rings six-member Six-Membered Heterocycled Six-membered heterocycles Six-membered heterocyclic rings Six-membered rings benzene