alpha-Aminobutyric acid

α-Aminobutyric acid
IUPAC name 2-Aminobutanoic acid
Other names 2-Aminobutyric acid; α-Aminobutanoic acid; Ethylglycine
Identifiers
CAS number	2835-81-6 Y
PubChem	6657
ChemSpider	6405 Y
UNII	8306QPJ19P Y
ChEBI	CHEBI:35621 Y
ChEMBL	CHEMBL55242 Y
Jmol-3D images	Image 1
SMILES O=C(O)C(N)CC
InChI InChI=1S/C4H9NO2/c1-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7) Y Key: QWCKQJZIFLGMSD-UHFFFAOYSA-N Y InChI=1/C4H9NO2/c1-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7) Key: QWCKQJZIFLGMSD-UHFFFAOYAG
Properties
Molecular formula	C4H9NO2
Molar mass	103.12 g/mol
Acidity (pKa)	2.55 (carboxyl), 9.60 (amino)
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

α-Aminobutyric acid (AABA) is an isomer of the amino acid aminobutyric acid with chemical formula C₄H₉NO₂. There is also gamma-aminobutyric acid (GABA) and beta-aminobutyric acid.

It is a key intermediate in the biosynthesis of ophthalmic acid or ophthalmate, which was first isolated from calf lens.