2-Ketobutanoic acid 2-Ketobutyric acid 2-Oxo-n-butyric acid 2-Oxobutanoic acid 2-Oxobutyric acid 2-keto-butyrate 2-ketobutyrate 2-oxo-butyrate 2-oxobutanoate 2-oxobutyrate 3-Methylpyruvic acid 600-18-0 Butanoic acid, 2-oxo- (9CI) Butyric acid, 2-oxo- (8CI) FEMA No. 3723 Formic acid, propionyl- Ketobutyrate Propionylformic acid Pyruvic acid, methyl- alpha-Ketobutyric acid alpha-Oxo-n-butyric acid alpha-Oxobutyric acid alpha-keto-n-Butyric acid butanoic acid, 2-oxo-