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  1. Cyclobutadiene - Wikipedia

  2. C4H4 - Wikipedia

  3. Vinylacetylene - Wikipedia

  4. Cyclobutadiene | C4H4 | CID 136879 - PubChem

  5. Cyclobutadiene Structure - C4H4 - Over 100 million chemical ...

  6. Butatriene Structure - C4H4 - Over 100 million chemical ...

  7. Vinylacetylene Structure - C4H4 - Over 100 million chemical ...