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2-Butenedioic acid | C4H4O4 | CID 723 - PubChem
顺丁烯二酸 - 百度百科
Maleic acid - Wikipedia
Maleic Acid | C4H4O4 | CID 444266 - PubChem
Butendioic acid - Wikipedia
(2E)-2-butenedioic acid - NIST Chemistry WebBook
butenedioic acid - Oxford Reference
Butenedioic acid | C4H4O4 - ChemSpider
Butanedioic acid - NIST Chemistry WebBook
Maleic acid Butenedioic Acid 110-16-7 - MilliporeSigma