2-(((2R)-2-Amino-2-carboxyethyl)thio)-3-hydroxy-L-tyrosine

2-S-cysteinyl-DOPA is an L-tyrosine derivative that is L-DOPA in which the hydrogen at position 2 on the phenyl ring is replaced by a cysteinyl group. Found in the urine of patients with melanoma. It has a role as a human urinary metabolite. It is a diamine, a L-tyrosine derivative, a member of catechols, an aryl sulfide, an amino dicarboxylic acid, a S-organyl-L-cysteine and a S-conjugate. It is functionally related to a L-dopa.