Fig. 1
From: Computational analysis of the interactions of a novel cephalosporin derivative with β-lactamases
Chemical structures of the different forms of 7-ACA derivative analyzed in this study. top) Diastereoisomeric form (3R, 4S); bottom) Diastereoisomeric form (3S, 4R). A and B indicate the reactive isolated 2-azetidinone ring and the β-lactam ring of the 7-ACA nucleus, respectively. The arrows indicate the positions where the rings are opened to simulate the acylation reaction