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  1. Butene - Wikipedia

  2. 1-Butene - Wikipedia

  3. Butene | Alkenes, Polymers, Petrochemicals | Britannica

  4. 1-Butene | C4H8 - ChemSpider

  5. 1-Butene | C4H8 | CID 7844 - PubChem

  6. 1-Butene - NIST Chemistry WebBook

  7. 1-butene | chemical compound | Britannica - Encyclopedia Britannica

  8. Butene | Formula, Properties & Application

  9. 1-butene Formula & Structure - Purdue University

  10. Butene - Purdue University

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