| abstract |
The present invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof wherein: A is a structure i, ii, iii, or iv; B is (a), (b), (c) W is NHC(=X)R1, or Y-het; provided that when A is a structure iv, W is not Y-het; Z is S(=O)(=N-R5); and R2 and R3 are independently H, F, CI, methyl or ethyl; which have potent activities against Gram-positive and Gram-negative bacteria. |