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2-Butene | C4H8 | CID 62695 - PubChem
But-2-ene - Wikipedia
2-butene | chemical compound | Britannica
2-Butene - NIST Chemistry WebBook
2-Butene | C4H8 - ChemSpider
2-Butene, (E)- - NIST Chemistry WebBook
2-Butene, (E)- - NIST Chemistry WebBook
顺-2-丁烯 - 百度百科
How to Write the Structural Formula for 2-Butene (cis and trans)
Butene | Alkenes, Polymers, Petrochemicals | Britannica