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  1. 1-Butyne | C4H6 | CID 7846 - PubChem

  2. 2-butyne Formula & Structure - Purdue University

  3. C4H6 Isomers Structures, Examples - Learn Chemistry High School ...

  4. C4H6 Isomers: How to draw possible structures and lewis ... - YouTube

  5. Butyne Structural Formula & Isomers - Lesson - Study.com

  6. 1-Butyne - NIST Chemistry WebBook

  7. 2-Butyne | C4H6 | CID 10419 - PubChem

  8. But-1-yne | C4H6 - ChemSpider

  9. 2-Butyne - Purdue University

  10. 2-Butyne - NIST Chemistry WebBook