Phosphoglyceric acids
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2-phosphoglyceric acid  (here: D -form)  | 
3-phosphoglyceric acid  ( D -form)  | 
With Phosphoglycerinsäuren (short: PGS), two chemical compounds, 2-phosphoglycerate (including glycerin acid 2-phosphate) and 3-phosphoglycerate (including glycerin acid-3-phosphate), respectively. These are derived from glyceric acid (2,3-dihydroxypropanoic) from by either the C 2 - hydroxy group or the C 3 -hydroxy group with phosphoric acid esterified are. In the metabolism of plants and animals, the D isomer occurs in particular .
The anions of phosphoglyceric acids are known as phosphoglycerates . In biochemistry, glycerates are used almost exclusively, as the carboxy group is dissociated under physiological conditions. As they contain three carbon atoms, the phosphoglyceric acids are called C3 bodies.