N-(Azido-PEG3)-N-Boc-PEG3-t-butyl ester dimethylbutyric acid Smiles: COC1C(=CC(=CC=1C(C)(C)C)N1C=CC(=O)NC1=O)C1=CC2=CC=C(C=C2C=C1)NS(C)(=O)=O
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