oxetane 3-hydroxypropionic acid beta-propiolactone CAS:57-57-8 3-propanolide 1,3-propiolactone KEGG:D05630 hydracrylic acid beta-lactone Beilstein:1360 3-hydroxypropionic acid beta-lactone VEZXCJBBBCKRPI-UHFFFAOYSA-N betaprone propiolactonum chebi_ontology propanolide beta-lactone hydracrylic acid beta-Propiolakton Drug_Central:3495 72.02113 KEGG:C19297 O=C1CCO1 0 propiolactone beta-propanoic acid lactone propiolactona oxetan-2-one C3H4O2 beta-propionolactone 2-oxetanone InChI=1S/C3H4O2/c4-3-1-2-5-3/h1-2H2 CHEBI:49073 betapron 72.06266 beta-propiolactone beta-Propiolactone Gmelin:141556 propan-3-olide