Scheme 1. Peptide backbone protection groups. (1) Pseudoproline(ψ-Pro), R = H, Ser; R = CH3, Thr. (2) Dimethoxylbenzyl (Dmb); (3) 2-hydroxy-4-methoxybenzyl (Hmb), (4) 2-hydroxy-4-methoxy-5-methylsulfinyl benzyl (Hmsb).
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