Boc-N-PEG1-C2-NHS ester ethyl-PEG4-propargyl Smiles: CC1(C)C[C@H]2C3=CC[C@@H]4[C@@]5(C)C[C@@H](O)[C@H](O)C(C)(C)[C@@H]5CC[C@@]4(C)[C@]3(C)CC[C@]2(CC1)C(O)=O
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