Date:9/4/2009

engine capitalizes on its proprietary high-resolution crystal structure of the ribosome, which performs an essential role in protein synthesis. Many known, commercially valuable antibiotics exert their effects by binding to the bacterial ribosome. The Company's integrated research strategy, which combines state-of-the-art, proprietary computational analysis, X-ray crystallography, medicinal chemistry, microbiology and biochemistry, allows it to rapidly synthesize new agents designed to avoid typical antibiotic resistance mechanisms. Rib-X's iterative intelligent engine has yielded several distinctive new antibiotics that can be used for the treatment of either community- or hospital-acquired infections. In addition to Rx-04, Rib-X has successfully completed Phase 2 trials with delafloxacin (RX-3341), a broad spectrum fluoroquinolone with potent activity against quinolone resistant Gram-positive bacteria including MRSA. Radezolid (RX-1741), an oxazolidinone that was discovered at Rib-X, as an oral/IV agent for treatment of serious Gram-positive infections has completed two Phase 2 trials and the Rx-02 discovery program which is focused on developing an IV/oral macrolide active against methicillin-resistant S. aureus, multidrug-resistant Streptococcus pneumoniae and S. pyogenes. Both delafloxacin and radezolid are currently in late stage clinical trials.

For more information on the Rib-X mission and the pipeline, please visit the Company website at www.rib-x.com.

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SOURCE Rib-X Pharmaceuticals, Inc. Copyright©2009 PR Newswire. All rights reserved

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