Figure 1. CBR inhibitors.
(A) Structure of the CBR hydroxamidine inhibitor CBR703 (compound of Example 1 of Li et al., 2001a).
(B) Structure of the CBR pyrazole inhibitor CBRP18 (compound of Example 18 of Li et al., 2001b).
(C) RNAP-inhibitory activities. IC50: concentration resulting in 50% inhibition.
(D) Growth-inhibitory activities. MIC: minimum inhibitory concentration. Antibacterial activities against Gram-negative enteric bacteria are limited to efflux-deficient strains (e.g., E. coli D21f2tolC). MICs against wild-type strains (e.g., E. coli type strain ATCC 25922) are >50 μg/ml.