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...Heterocyclic nomenclature replacement iupac recommended oxygen oxa sulfur thia nitrogen aza lowest number assigned to the hetero atom with highest precedence o s n nh thiacyclobutane azacyclopentane hantzsch widman suffixes ring without members unsat d sat irine iridine irene ete etidine etane ole olidine olane ine perhydro in ane epine epin epane you must know names h oxirane thiirane aziridine ethylene oxide sulfide imine oxacyclopropane thiacyclopropane azacyclopropane diazirane azirine oxaziridine oxazacyclopropane oxetane thietane azetidine oxacyclobutane azacyclobutane azete azetine azacyclobutadiene azacyclobutene furan thiophene pyrrole oxole thiole oxacyclopentandiene thiacyclopentandiene dioxolane tetrahydrofuran dioxacyclopentane pyrrolidine...