CAS No. 1256788-06-3 239(Azido-PEG3)-N-bis(PEG1-t-butyl ester) InChi: InChI=1S/C24H33N3O2/c1-14(2)27-13-15-11-21-18(17-6-4-8-20(27)23(15)17)10-16(12-26(21)3)24(29)25-19-7-5-9-22(19)28/h4
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