2112731-81-2

N-(Azido-PEG2)-N-bis(PEG4-t-butyl ester) is a branched PEG compound with a terminal azide group. The azide groups is very reactive with alkyne such as DBCO, BCN and propargyl reagnet via Click Chemistry. . The t-butyl protected carboxyl groups can be deprotected under mild acidic conditions.