4-AA-Ala-Ala-Ala-PEG4-TFP ester O=C1N(C2C(NC(CC2)=O)=O)C(C3=CC=CC(NCC4=CN(CCOCCOCCOCCC(O)=O)N=N4)=C31)=O 1021/ja1083909 Keywords: Biotinylation Reagent
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