Abstract
The substance producing the controversial pink spot on paper chromatograms from urine obtained from patients with Parkinson's disease and some schizophrenics has been submitted to mass spectrographic, ultra-violet and infra-red analysis. The results of these studies would seem to suggest that the pink spot first found by Friedhoff and van Winkle consists of p-tyramine and not β-3,4-dimethoxyphenylethylamine as was previously thought.
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