Trifluoromethanesulphonic acid was applied to remove the protecting groups, Z and MBzl, from Z-Ala-Gly-Cys (MBzl)-Lys (Z)-Asn-Phe-Phe-Trp-Lys (Z)-Thr-Phe-Thr-Ser-Cys (MBzl)-OH to produce the peptide with somatostatin activity.
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Fujii et al. (1975) studied this question.