Antibacterial Antibiotics Inhibitors of Cell Wall Synthesis B-lactam ring 0 0 S、 CH3 S、/cH R-C-NH-CHCH Penicillinase R-C-NH-CH-HC CH3 CH C—N—CH-COOH 0=C N-CH-COOH 0 H OH Penicillin Penicilloic acid Figure 20.8Antibacterial Antibiotics Inhibitors of Cell Wall Synthesis Figure 20.8