Isobutylene

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\byü-tәl-ēn\ n [ISV] (1872) A colorless, very volatile liquid or flammable gas, C4H8, used chiefly in the manufacture of butyl rubber.http://static-content.springer.com/image/prt%3A978-1-4419-6247-8%2F9/MediaObjects/978-1-4419-6247-8_9_Part_Fig1-6497_HTML.jpg