The molecule is an oxo carboxylic acid anion that is the conjugate base of 5-(3-carboxy-3-oxoprop-1-en-1-yl)-4-hydroxy-6-oxo-1,6-dihydropyridine-2-carboxylic acid. It is a conjugate base of a 5-(3'-carboxy-3'-oxopropenyl)-4,6-dihydroxypicolinic acid.
6-carboxy-3-[(E)-3-carboxy-3-oxoprop-1-enyl]-2-oxo-1H-pyridin-4-olate