Br-PEG9-C2-NHBoc PEG4-Br C2HF3O2/c1-6-17(4)26(30(48)36-18(5)27(45)34-14-23(42)37-19(31(49)50)9-10-22(33)41)39-24(43)15-35-28(46)20(12-16(2)3)38-29(47)21-8-7-11-40(21)25(44)13-32
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