Description Application 3-Bromobutyric acid was used in the synthesis of β-butyrolactone, monomer for a naturally occurring polyester, D-poly-β-hydroxybutyrate[1]. It was used to investigate the effect of halo acids on the activity of aspartate aminotransferase isoenzymes in their pyridoxamine form[2]. It was also used in the synthesis of optically active β-lactones[3]. Packaging 5 mL in glass bottle