abstract |
The present invention provides antibacterial agents of formula (I), or a pharmaceutically acceptable salt thereof, wherein A is a structure (i), (ii), (iii) or (iv); X is (a) NHC(=O)R1, (b) NHC(=S)R1, (c) NH-het1, (d) O-het1, (e) S-het1, or (f) het2. |