(13)Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (13) Preparation of Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (12)Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin(20DMF)5203DMF3DMF2Fmoc-Pro-OH0.8gDIEA0.4mlTBTU0.56gHOBT0.2gDMF10ml1.53DMF3DMF2Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin In the Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin of step (12), add decapping reagent (20% DMF solution of piperidine), reacted at room temperature for 5 minutes, drained, re-added capping agent and reacted at room temperature for 20 minutes, washed 3 times with isopropanol, washed 3 times with DMF, washed 2 times with re-distilled DMF, drained, added Fmoc-Pro-OH0.8g, DIEA0.4ml, TBTU0.56g, HOBT0.2g, DMF10ml, react at room temperature for 1.5 hours, dry with a vacuum pump, wash with isopropanol for 3 times, DMF for 3 times, and redestilled DMF for washing 2 times, drained to obtain Fmoc-Pro-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-WangResin
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