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Hydrogen-bonding interactions in the -d-Ala-d-Ala peptidoglycan-vancomycin host-guest complex (left) compared to the -d-Ala-d-Lac peptidoglycan-vancomycin host-guest complex (right). The loss of a key hydrogen bond, and its replacement by unfavorable non-bonding repulsive interactions, is indicated by the red-colored arrows in the -d-Ala-d-Lac depsipeptide complex.161
