The molecule is trianion of 1-carboxyvinyl carboxyphosphonate arising from deprotonation of the carboxy and phosphonate groups; major species at pH 7.3. It is a dicarboxylic acid dianion and an organophosphonate oxoanion. It is a conjugate base of a 1-carboxyvinyl carboxyphosphonate.
2-[carboxylato(oxido)phosphoryl]oxyprop-2-enoate