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  1. 2-Butenedioic acid | C4H4O4 | CID 723 - PubChem

  2. 顺丁烯二酸 - 百度百科

  3. Maleic acid - Wikipedia

  4. Maleic Acid | C4H4O4 | CID 444266 - PubChem

  5. Butendioic acid - Wikipedia

  6. (2E)-2-butenedioic acid - NIST Chemistry WebBook

  7. butenedioic acid - Oxford Reference

  8. Butenedioic acid | C4H4O4 - ChemSpider

  9. Butanedioic acid - NIST Chemistry WebBook

  10. Maleic acid Butenedioic Acid 110-16-7 - MilliporeSigma