Report - Polymyxins Facilitate Entry into Mammalian Cells · L-Thr10 D-Phe6 R1 = NNHBoc H NBoc NHBoc a b R1 NNHBoc N NBoc a) Boc-ON, NEt3 CH3OH/H2O or b) NEt 3, CH2Cl/CHOH H2N H N N H OH O

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