Fmoc-NMe-PEG4-NHS ester e E Smiles: CC(C)(C)OC(=O)N1[C@@H](COC1(C)C)[C@H]1C2=C(OCC=C)C(OC)=C(C)C=C2C[C@@H](COC(C)=O)N1C(=O)OCC=C
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