Fmoc-Cl+NHS gives Fmoc-Osu during this reaction which imurities formation ?

Fmoc-Cl+NHS gives Fmoc-Osu during this reaction which impurities formation ? I prepared it, obtained 99% HPLC purity. But 10% solution of Fmoc-Osu in acetone solution was not clear, hazyness was...

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