计算溶液所需的质量、体积或浓度。
N-(Boc-PEG23)-N-bis(PEG3-azide) is a branched PEG derivative with two terminal azide group and a Boc-protected amino group. The azide groups enable PEGylation via Click Chemistry. The Boc group can be deprotected under mild acidic conditions to form the free amine.