Dihydroxyphenylalanine

**Definition:** A beta-hydroxylated derivative of phenylalanine. The D-form of dihydroxyphenylalanine has less physiologic activity than the L-form and is commonly used experimentally to determine whether the pharmacological effects of LEVODOPA are stereospecific.

**Tree numbers:** - D02.092.311.200 - D02.455.426.559.389.657.166.175.200 - D12.125.072.050.685.400 - D12.125.072.050.875.130

**Synonyms:** - 3,4-Dihydroxyphenylalanine - Dopa - 3-Hydroxy-DL-tyrosine - beta-Hydroxytyrosine