(12)Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val- (12) Preparation of Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin: (11)Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-1050530105010603DMF3DMF2DMFFmoc-Pro-OHDIEATBTU/HOBtHBTU/HOBtBOP/HOBt105010603DMF3DMF2Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val- In the Fmoc-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu-Val-resin in step (11), add the decapping reagent and react at 1050C 5 to 30 minutes, dry with a vacuum pump, re-add the decapping reagent at 10 to 50 C for 10 to 60 minutes, dry, wash with isopropanol for 3 times, DMF for 3 times, re-distilled DMF for 2 times, add Dissolve Fmoc-Pro-OH, DIEA, TBTU/HOBt or HBTU/HOBt or BOP/HOBt mixture in DMF, react at 10-50C for 10-60 minutes, dry with vacuum pump, wash with isopropanol 3 times, DMF Washed 3 times, washed 2 times with re-distilled DMF, and dried to obtain Fmoc-Pro-Pro-Gly-Lys(Boc)-Pro-Ala-Asp(otBu)-Asp(otBu)-Ala-Gly-Leu- Val-resin

13 C NMR (100 MHz, DMSO-d 6 ) = 163.5, 162.4, 149.6, 149.6, 145.7, 139.3, 139.2, 126.0, 125.4, 116.6, 113.4
By reducing melanin production, it can help diminish the appearance of dark spots and promote an even complexion
Preliminary studies suggest that it can ameliorate the decline of energy metabolism in elderly individuals, showing antiaging potential