4-​Hydroxyphenylpyruvic acid

4-Hydroxyphenylpyruvic acid (4-HPPA) is a key keto acid intermediate in tyrosine catabolism, serving as a substrate for 4-hydroxyphenylpyruvate dioxygenase (HPD) . It is utilized in research on inborn errors of metabolism like tyrosinemia type III and hawkinsinuria, as well as in enzymatic studies for both in vitro and in vivo metabolic pathway investigations.