Biotin-PEG7-thiourea ethyl-PEG5-ethylphosphonic acid Smiles: CC(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC1=CN=CN1)C(=O)NC(CC(O)=O)C(=O)NC1=CC2OC(=O)C=C(C=2C=C1)C(F)(F)F
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