3.6.3. Cleavage of Linear Protected Peptide

After swelling the 2-CTC resin for 20 min in dry CH2Cl2 (2 mL), the resin was mixed with 20% hexafluoro-2-propanol (HFIP)/CH2Cl2 (2 mL × 3 × 20 min and the combined filtrate concentrated in vacuo to give the protected linear peptide (64 mg). The product was confirmed by HPLC-DAD-MS (method as described in general experimental section): *t*<sup>R</sup> = 4.4 min, ESI(+)MS *m*/*z* 776 [M + H]+, and was used in the next step without further purification.
