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In page Daminozide:

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While described by the FDA as an amino acid derivative,[1] daminozide is more formally and correctly described as a dicarboxylic acid monohydrazide.[2][citation needed] It is the product of the condensation of succinic acid with 2,2-dimethylhydrazine,[citation needed] and in its pure form is a high-melting temperature water-soluble white crystalline solid.[1][citation needed]