123-76-2 19856-23-6 3-Acetylpropionic acid 3-Acetylpropionsaeure 3-Ketobutane-1-carboxylic acid 4-03-00-01560 (Beilstein Handbook Reference) 4-Ketovaleric acid 4-Oxopentanoic acid 4-Oxopentansaeure 4-Oxovaleric acid 591-64-0 AI3-03377 Acetopropionic acid Acidum laevulinicum BRN 0506796 EINECS 204-649-2 FEMA No. 2627 LEVA LEVULINIC ACID Laevulic acid Laevulinic acid Levulic acid Levulinsaeure NSC 3716 Pentanoic acid, 4-oxo Pentanoic acid, 4-oxo- Propionic acid, 3-acetyl- USAF CZ-1 Valeric acid, 4-oxo- beta-Acetylpropionic acid gamma-Ketovaleric acid