.beta.-Propanoic acid lactone .beta.-Propiolactone .beta.-Propionolactone .beta.-Proprolactone 1,3-Propiolactone 2-Oxetanone 3-Hydroxypropionic acid, lactone 3-Propanolide 3-Propiolactone 57-57-8 BPL Betaprone Hydracrylic acid .beta.-lactone Hydracrylic acid, .beta.-lactone NSC21626 Propanoic acid, 3-hydroxy-, .beta.-lactone Propanolide Propiolactone Propiolactone .beta.- Propionic acid, 3-hydroxy-, .beta.-lactone WLN: T4OVTJ