An unexpected stereochemical effect of thio-substituted Asp in native chemical ligation
a State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
b Center of Pharmaceutical Technology, School of Pharmaceutical Sciences, Tsinghua University, Beijing 100084, China
c Chemical Engineering College, Hebei Normal University of Science and Technology, Qinhuangdao 066600, China
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