The molecule is an organosulfonate oxoanion which is also a monocarboxylic acid anion obtained by deprotonation of the sulfo and carboxy groups of tartrazine acid. It is a monocarboxylic acid anion and an organosulfonate oxoanion. It is a conjugate base of a tartrazine acid.
5-oxo-1-(4-sulfonatophenyl)-4-[(4-sulfonatophenyl)diazenyl]-4H-pyrazole-3-carboxylate