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  1. Butadiene - Wikipedia

  2. 1,3-Butadiene | C4H6 | CID 7845 - PubChem

  3. BUTADIENE (1,3-BUTADIENE)‡ - Occupational Safety and Health ...

  4. 1,3-Butadiene - Overview | Occupational Safety and Health ...

  5. 1,3-Butadiene - Cancer-Causing Substances - NCI

  6. 1,3-Butadiene - Chemical Safety Facts

  7. 1,3-Butadiene - NIST Chemistry WebBook