(S)-5-((3,4-Dihydroxyphenyl)methyl)-3-phenyl-2-thioxo-4-imidazolidinone 132828-63-8 4-Imidazolidinone, 5-((3,4-dihydroxyphenyl)methyl)-3-phenyl-2-thioxo-, (S)- Phenylthiohydantoin-3,4-dihydroxyphenylalanine Pth-dopa