m-PEG4-NHS ester 5-Boc Smiles: CC(C)C[C@H](NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CC1=CNC=N1)NC(=O)[C@H](CC1=CNC=N1)NC(=O)[C@@H](N)C(C)C)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CC1C=CC=CC=1)C(=O)N[C@@H](CC1C=CC=CC=1)C(O)=O
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