2-Sec-butyl-2-butenedioic acid;2-(butan-2-yl)but-2-enedioic acid;NSC56426;6621-99-4;AC1NZY5U;AC1Q5T6A;AR-1C8671;NSC 56426;(Z)-2-butan-2-ylbut-2-enedioic acid
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