| abstract |
The invention provides a novel oxazolidinone derivative represented by the formula (I): n n n n n n n n n n whereinn Ring A is optionally substituted or fused and representsn n(A-1) at least 7-membered monocyclic hetero ring containing at least three N atoms; (A-2) at least 6-membered monocyclic hetero ring containing at least two N atoms and at least one O atom; or (A-3) at least 7-membered monocyclic hetero ring containing at least two N atoms and at least one S atom;n X 1 is a single bond, —O—, —S—, —NR 2 —, —CO—, —CS—, —CONR 3 —, —NR 4 CO—, —SO 2 NR 5 —, and —NR 6 SO 2 — (wherein R 2 -R 6 are independently hydrogen or lower alkyl), or lower alkylene or lower alkenylene in which one of the preceding groups may intervene; Ring B is optionally substituted carbocycle or optionally substituted heterocycle; R 1 is hydrogen, or an organic residue which is able to bind to the 5-position of oxazolidinone ring in oxazolidinone antimicrobial agent,n nand an antibacterial agent containing the same. |