2-Carboxyethyl gamma-aminobutyric acid 4-((2-Carboxyethyl)amino)butanoic acid 4-((2-Carboxyethyl)amino)butyric acid 4-04-00-02609 (Beilstein Handbook Reference) 4386-03-2 BRN 1774240 BUTANOIC ACID, 4-((2-CARBOXYETHYL)AMINO)- Butyric acid, 4-((2-carboxyethyl)amino)- (6CI,7CI,8CI) Carboxyethyl-gamma-aminobutyric acid EINECS 224-497-0 Spermidic acid