m-PEG4-NHS ester 5-Boc Smiles: C=CCN(C1CCN(C[C@H]2CN(C[C@]2(O)C2C=CC=CC=2)C(=O)C2CCCC2)CC1)C(=O)OCC1C=CC(=CC=1)[N+]([O-])=O
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