Abstract: Compounds of formula (I) and their pharmaceutically acceptable salts are described. Processes for their preparation, pharmaceutical compositions containing them, their use as medicaments and their use in the treatment of bacterial infections are also described.

Abstract: Compounds of the formula (I), or a pharmaceutically-acceptable salt, or an in-vivo-hydrolysable ester thereof, wherein —N-HET is, for example, (Ic) or (If) wherein R1 is (1-4C)alkyl; Q is selected from, for example, Q1 wherein R2 and R3 are independently hydrogen or fluoro; T is selected from a range of groups, for example, wherein m is 0, 1 or 2; are useful as antibacterial agents; and processes for their manufacture and pharmaceutical compositions containing them are described.

Abstract: Compounds of the formula (I): or a pharmaceutically-acceptable salt or pro-drug thereof: wherein R1 is selected for example from hydrogen, halogen, optionally substituted methyl; R2 and R3 are independently selected from hydrogen, fluoro, chloro and trifluoromethyl; R4 and R5 are independently selected, for example, from hydrogen, methyl, optionally substituted (2-4C)alkyl, C(O)R6 or R4 and R5 together with the nitrogen to which they are attached form an optionally substituted 5 or 6 membered, saturated or partially unsaturated heterocyclyl ring or an optionally substituted imidazole ring. Methods for making the compounds of formula (I), compositions containing them and their use as antibacterial agents are also described.

Abstract: Compounds of the formula (I), or a pharmaceutically-acceptable salt, or an in-vivo-hydrolysable ester thereof, wherein —N-HET is, for example, (Ic) or (If) wherein R1 is, for example, halogen or a (1–4C)alkyl group which is substituted by one substituent selected from, for example, hydroxy, (1–4C)alkoxy, amino, cyano or azido; Q is selected from, for example, Q1 wherein R2 and R3 are independently hydrogen or fluoro; T is selected from a range of groups, for example, wherein m is 0, 1 or 2; are useful as antibacterial agents; and processes for their manufacture and pharmaceutical compositions containing them are described.

Abstract: Compounds of the formula (I), or a pharmaceutically-acceptable salt, or an in-vivo-hydrolysable ester thereof, (I) R1a is NH(C?W)R5 or (a); W is O or S; R2 and R3 are for example H or F; R1 is for example hydrogen, or halogen; R5 is selected from hydrogen, (2–6C)alkyl (optionally substituted); R6 and R7 are independently selected from hydrogen, and (1–4C)alkyl (optionally substituted); wherein R4 is either a hydroxymethyl substituent on C-4? of the isoxazoline ring; or R4 is a hydroxymethyl substituent on C-5? of the isoxazoline ring and the stereochemistry at C-5? of the isoxazoline ring and at C-5 of the oxazolidinone ring is selected, such that the compound of formula (I) is a single diastereomer; are useful as antibacterial agents; and processes for their manufacture and pharmaceutical compositions containing them are described