SEARCH Articles Figures Tables Containing Heteroatoms Five Heteroatoms Five-Membered Heterocycled Five-membered Heterocycles containing One Heteroatom Pyrrole, Furan and Thiophene Five-membered heterocycles Five-membered heterocyclics Heteroatom heterocycles Heteroatom-containing Heteroatoms Heterocycles Heterocycles containing