Aliphatic acids that contain four carbons in a branched-chain configuration. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the 2-carboxypropane structure.

Synonyms: 0, Dimethylacetic Acids, 2-Methylpropionic Acids, Isobutyric Acids, Isobutyrates, 2 Methylpropionic Acids