-etine

== English == === Etymology === IUPAC Commission of Nomenclature for Heterocyclic Compounds (1957) === Suffix === -etine (organic chemistry, obsolete) Indicating a 4-ring heterocyclic compound with nitrogen and one double bond ==== Usage notes ==== Names with the suffix -etine are deprecated by IUPAC. ==== Derived terms ==== === References === Hantzsch–Widman nomenclature on Wikipedia.Wikipedia Revision of the extended Hantzsch-Widman system of nomenclature for heteromonocycles, Rule RB-1.1, Note 3