SEARCH Articles Figures Tables 5-Membered rings heteroatoms Five Heteroatoms Five-Membered Heterocycled Five-Membered Rings One Heteroatom Five-membered heterocycles Five-membered heterocycles with one Five-membered heterocycles with one heteroatom Five-membered heterocyclic rings Five-membered heterocyclics Five-membered ring Five-membered rings heteroatoms Heteroatom heterocycles Heteroatomic Rings Heteroatoms Heterocycles Heterocycle, five ring Heterocycles with One Heteroatom Heterocycles with heteroatoms Heterocyclic 5- membered ring Of heterocycles: five-membered rings with Of heterocyclic rings