Abstract
The pyruvic acid analogues of thyroxine and triiodothyronine were synthesized, the latter for the first time, from their corresponding amino acids by simplified methods. These pyruvic acid analogues were clearly separated from their corresponding acetic acid analogues by chromatography in tert. amylalcohol saturated with 1/15 phosphate buffer (Sørensen pH 6.47). FeCU (0.2%) in absolute alcohol was found to be a specific and excellent reagent

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