N-Alpha-acetyllysine is a N-acetylated amino acid. It is a normal constituent of human urine with concentrations in normal samples too small to allow its routine detection; however it has been found at increased levels in the urine of a patient with aminoacylase I deficiency.

2',4'-Dimethylacetophenone is a chemical that can be used in biological research. The compound can be used in gas chromatography to detect aldosterone aroma in tobacco compounds and can be used to protect food products.

Dimethylmalonic acid（2,2-Dimethylmalonic acid） is a short-chain dicarboxylic acid found in human serum that can be used to prevent or retard denaturation of fish actinomyosin in freezing buffer solution (pH 7).