CAS No. 1256788-06-3 239(Azido-PEG3)-N-bis(PEG1-t-butyl ester) Smiles: COC(=O)C1[C@H](C(C(=O)OCCCN2CCC(CC2)(C2C=CC=CC=2)C2C=CC=CC=2)=C(C)NC=1C)C1C=C(C=CC=1)[N+]([O-])=O
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