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2,4-Dihydroxybutanoic acid

2,4-Dihydroxybutanoic acid or 3-Deoxytetronic acid is usually absent in normal human urine extracts or in only trace constituents in neonates. (PMID 1192581) However, various cases of succinic semialdehyde dehydrogenase deficiency have shown consistently increased amounts of this metabolite. (PMID 3126356).