SEARCH Articles Figures Tables 4- Hydroxyphenylpyruvic acid 4- Hydroxyphenylpyruvic acid/4-Hydroxyphenylpyruvate 4-Hydroxyphenylpyruvic Hydroxyphenylpyruvate P-hydroxyphenylpyruvate Tyrosinosis and Other Cases of p Hydroxyphenylpyruvic Acid Excretion