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The couplings of N-protected amino acid esters with amino acid amides proved to be carried out in anhydrous acetonitrile in the presence of Bacillus licheniformis protease (subtilisin Carlsberg) immobilized on Celite. The maximal peptide yields were obtained with the immobilized enzyme prepared through lyophilization from a pH 10.7 buffer solution. A series of dipeptide syntheses and several segment...
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