Ketobutyric acid
Ketobutyric acid, ketobutanoic acid, oxobutyric acid, or oxobutanoic acid may refer to the following chemical compounds:

 α-Ketobutyric acid (2-oxobutyric acid)
 β-Ketobutyric acid (acetoacetic acid or 3-oxobutyric acid)

In addition, oxobutyric acid, or oxobutanoic acid may refer to:

 4-Oxobutanoic acid (succinic semialdehyde, 4-oxobutyric acid)

See also 
 Dicarbonyl