Novel gyrase inhibitors and related compositions and methods are useful for impeding bacterial growth. Compounds of Formula (I), are disclosed: Formula (I), wherein Y is N or CH Z is N or CR5 R5 is H, a substituted or unsubstituted hydrocarbyl residue (1-3C) containing 0-2 heteroatoms selected from O, S and N, or is an inorganic residue L is O, S, NR7, or CR8R9 R7 is H or C1-3 alkyl R8 and R9 are each independently H or C1-3 alkyl R2 is H, a hydrocarbyl residue (1-40C) containing 0-10 heteroatoms selected from O, S and N optionally substituted with an inorganic residue R4 is H, an inorganic residue, or a hydrocarbyl residue (1-30C) containing 0-12 heteroatoms selected from O, S and N and containing 0-10 inorganic residues, wherein R5 and R4 together may join to form a fused ring and R6 is selected from the group consisting of H, C1-5 alkyl, C2-5 alkenyl, C2-5 alkynyl, halo C1-5 alkyl, halo C2-5 alkenyl, halo C2-5 alkynyl, C1-5 hydroxyalkyl, C1-5 alkyl chloride, C2-5 alkenyl chloride, and C2-5 alkynyl chloride or a pharmaceutically-acceptable salt, ester, or prodrug thereof.
