The molecule is trianion of 3-phosphoglyceric acid arising from deprotonation of the carboxy and phosphate groups; major species at pH 7.3. It is a 3-phosphoglycerate and a phosphoglycerate. It is a conjugate base of a 3-phosphoglycerate(2-) and a 3-phosphoglyceric acid.
2-hydroxy-3-phosphonatooxypropanoate