Imports In 2000, Syria imported $7 in Butene (butylene) and isomers thereof, becoming the 0th largest importer of Butene (butylene) and isomers thereof in the world. At the same year, Butene (butylene) and isomers thereof was the 0th most imported product in Syria. Syria imports Butene (butylene) and isomers thereof primarily from: N/A.