SMILES: CP(=O)(CCC(=O)C(=O)O)O
Description: The molecule is a butyric acid derivative having an oxo group at the 2-position and a hydroxymethylphosphinyl moiety at the 4-position. It derives from a butyric acid. It is a conjugate acid of a 4-(hydroxymethylphosphinyl)-2-oxobutyrate.