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In this paper the synthesis of alpha-human atrial natriuretic polypeptide fragments (positions, 1-4, 5-10, 11-16, 17-22, 23-28) by solution method is reported. In the synthesis of some peptides, the results from mixed anhydride procedure and active ester procedure are compared. In the synthesis of other peptides, the effects of reaction temperature, basicity of catalyst, and reaction time on the specific rotations and yields of these compounds are observed. The sequence of amino acids of all the protective polypeptides is confirmed by FAB-MS.
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