N-(Azido-PEG3)-N-Boc-PEG3-t-butyl ester dimethylbutyric acid C4H6O4/c1-15(2)23(7-4-18(11-23)29-20-6-9-33-14-21(20)32-3)22(31)30-8-5-19-16(13-30)10-17(12-28-19)24(25
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