Abstract
SAR studies on the water-soluble thioether pleuromutilin analogue 6, which has excellent in vitro and in vivo antibacterial activities, led to discovery of the novel pleuromutilin derivatives having a piperazine ring spacer. These derivatives displayed potent and well-balanced in vitro antibacterial activity against various drug-susceptible and -resistant Gram-positive bacteria. In particular, the promising pleuromutilin analogues 37 and 40 were found to exhibit strong in vivo efficacy against Staphylococcus aureus Smith.
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