2-Ketobutyric acid 2-Oxobutanoic acid 2-Oxobutyric acid 2013-26-5 3-Methylpyruvic acid 600-18-0 BUTANOIC ACID, 2-OXO- Butyric acid, 2-oxo- EINECS 209-986-9 FEMA No. 3723 Formic acid, propionyl- Ketobutyrate NSC 60533 Pyruvic acid, methyl- alpha-Ketobutric acid alpha-Ketobutyric acid alpha-Oxo-n-butyric acid alpha-Oxobutyrate