Antibiotics Penicillin and related compounds(cephalosporins fy l kill bacteria by inactivating an enzyme responsible for strengthening the bacteria cell wall NH H penicillin G cephalexin He most other antibiotics, are produced by microorganisms that can be mass-producedlgas Fig 14.8 Penicillins, such as penicillin G, and cephalosporin, such as cephalexin, as well large vats. The antibiotics are then harvested and purified• Antibiotics • Penicillin and related compounds (cephalosporins, 头孢 霉素) kill bacteria by inactivating an enzyme responsible for strengthening the bacteria cell wall. NH2 O N H N S CH3 HO O O O N H O N S CH3 CH3 O OH Fig 14.8 Penicillins, such as penicillin G, and cephalosporin, such as cephalexin, as well as most other antibiotics, are produced by microorganisms that can be mass-produced in large vats. The antibiotics are then harvested and purified penicillin G cephalexin