D

N CH COOH

ß-lactam ring

(b) Cephalosporin

ß-lactam ring

Figure 21.4 The ß-Lactam Ring of Penicillins and Cephalosporins The core chemical structure of (a) a penicillin (b) a cephalosporin.The ß-lactam rings are marked by an orange circle.The R groups vary among different penicillins and cephalosporins.

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