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(5)制备Fmoc-Asp(otBu)-Ala-Gly-Leu-Val-WangResin (5) Preparation of Fmoc-Asp(otBu)-Ala-Gly-Leu-Val-WangResin 在步骤(4)的Fmoc-Ala-Gly-Leu-Val-WangResin中，加入脱帽试剂(20％哌啶的DMF溶液)，常温反应5分钟，抽干，重新加入脱帽剂常温反应20分钟，用异丙醇洗涤3次，DMF洗涤3次，重蒸过的DMF洗涤2次，抽干，加入Fmoc-Asp(otBu)-OH1.2g，DIEA0.4ml，TBTU0.56g，HOBT0.2g，DMF10ml常温反应1.5小时，用真空泵抽干，用异丙醇洗涤3次，DMF洗涤3次，重蒸过的DMF洗涤2次，抽干，获得Fmoc-Asp(otBu)-Ala-Gly-Leu-Val-WangResin； In the Fmoc-Ala-Gly-Leu-Val-WangResin of step (4), add decapping reagent (DMF solution of 20% piperidine), react at normal temperature for 5 minutes, drain, add decapping agent normal temperature and react for 20 minutes, use Wash 3 times with isopropanol, 3 times with DMF, 2 times with distilled DMF, drain, add Fmoc-Asp(otBu)-OH1.2g, DIEA0.4ml, TBTU0.56g, HOBT0.2g, DMF10ml at room temperature Reacted for 1.5 hours, dried with a vacuum pump, washed 3 times with isopropanol, washed 3 times with DMF, washed 2 times with re-distilled DMF, and dried to obtain Fmoc-Asp(otBu)-Ala-Gly-Leu-Val- Wang Resin