SEARCH Articles Figures Tables 14-membered ring structures 6-Membered rings aromatic ring Aromatic 6-Membered Compounds Aromatic compounds ring structure Aromatic compounds structures Aromatic ring structure Aromatic structures Aromatics structure Five-membered ring Heteroaromatic compounds structures Heteroaromaticity Heteroaromatics Membered Aromatic Rings Ring compounds, structure Ring compounds, structure five-membered Ring structure five-membered rings Ring structures Ring structures 5- membered rings