Copyright ©2014 Baishideng Publishing Group Inc.
World J Gastrointest Endosc. Oct 16, 2014; 6(10): 457-474
Published online Oct 16, 2014. doi: 10.4253/wjge.v6.i10.457
Figure 3
Figure 3 Displayed are the core chemical structures of two different types of β-lactam antibiotics: A penicillin and a carbapenem. Both antibiotics feature the four-membered β-lactam ring. A: The core chemical structure of penicillin antibiotics; B: The core chemical structure of carbapenem antibiotics. (*The “R” in either diagram denotes a distinct side chain that is attached to the molecule’s core).