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).
G. A. Swan, J. Chem. Soc., Perkin Trans. 1, 1976, 339 DOI: 10.1039/P19760000339
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