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Unprotected O-acylated serine and O-acylated threonine isopeptides have been synthesized, and their conversion to native tripeptides and tetrapeptides by O-to N-terminus transfer investigated.Ligations involving 8-and 11-membered cyclic transition states are shown experimentally and computationally to be more favorable than intermolecular cross-ligations.
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Panda et al. (2014) studied this question.
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