targeted_by_antibiotic vancomycin teicoplanin targeted_by_antibiotic ristocetin antibiotic A47934 balhimycin chloroeremomycin oritavancin dalbavancin telavancin antibiotic A40926 acyl-D-alanyl-D-alanine ARO:3000720 antibiotic_resistance The acyl-D-alanyl-D-alanine group is found at the terminal end of the pentapeptide chains of peptidoglycan subunits. Antibiotics that bind to this group block the addition of subunits, inhibiting peptidoglycan synthesis. This group is most accessible in Gram-postive bacteria. cell wall component targeted by antibiotic avoparcin