SEARCH Articles Figures Tables 14-membered ring structures Alkenes derivatives, five-membered ring structure Five-membered ring Five-membered ring structures, -coordination Heteroaromatic compounds five-membered aromatic ring structures Olefins derivatives, five-membered ring structure Ring compounds, structure five-membered Ring structures Ring structures 5- membered rings Structure comprising Two Five-Membered Rings Structure of Five-membered Rings with One Heteroatom Structure of Five-membered Rings with Two or More Heteroatoms Thiophene derivatives five-membered ring structure