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(a) The X-ray crystal structure of Ac-Lys(Ac)-DAla-DAla-O− (yellow) bound to vancomycin (grey). (b) The proposed model for delivery of phenyloxythiocarbonyl to the G6-hydroxyl by Cbz-Lys(Cbz)-DAla-DPmh-O− (green). X-ray structure adapted from ref 18, PDB # 1FVM.
