This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 4-hydroxyphenyllactate:NAD+ oxidoreductase. This enzyme is also called HPRP. This enzyme participates in tyrosine metabolism and phenylalanine metabolism.
Petersen M and Alfermann AW (1988). "Two new enzymes of rosmarinic acid biosynthesis from cell cultures of Coleus blumei: hydroxyphenylpyruvate reductase and rosmarinic acid synthase". Z. Naturforsch. C: Biosci.43: 501–504.