Abstract
The oxidation product of 2,4,5-trihydroxyphenethylamine (1a) formulated by Senoh and Witkop as 2,3-dihydro-6-hydroxyindole-4,7-quinone (3a) is 2-(2-aminoethyl)-5-hydroxy-p-benzoquinone (2a) and undergoes cyclisation to yield a dopachrome-type product (4a) and thence 5,6-dihydroxyindole (5a).

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