环戊烯 Traditional form: 環戊烯 Pinyin (reading): huánwùxī Definitions: cyclopentene C5H8 (ring of five carbon atoms) Characters: 环 - bracelet, ring; to surround, to loop 戊 - 5th heavenly stem 烯 - alkene Traditional characters: 環 - bracelet, ring; to surround, to loop 戊 - 5th heavenly stem 烯 - alkene