Direct polycondensations of N N-(4 4-oxydiphthaloyl)- bis-L-leucine diacid by use of tosyl chloride in the presence of N N-dimethylformamide

Direct polycondensations of N N-(4 4-oxydiphthaloyl)- bis-L-leucine diacid by use of tosyl chloride in the presence of N N-dimethylformamide
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