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Biological Activity: Hydroxypyruvic acid phosphate serves as a crucial metabolic intermediate in the biosynthesis of L-Serine, being formed from the conversion of the glycolytic intermediate 3-phosphoglycerate through the action of 3-phosphoglycerate dehydrogenase. Subsequently, it is transformed into phosphoserine by phosphohydroxypyruvate aminotransferase, and finally, via the action of phosphoserine phosphatase, it is converted into L-Serine. This pathway not only highlights the significance of hydroxypyruvic acid phosphate in cellular proliferation but also emphasizes its role in providing essential one-carbon groups necessary for the synthesis of purine nucleotides and deoxythymidine monophosphate, thereby underscoring its metabolic importance in the central nervous system and various physiological conditions.