| 摘要 |
1. A beta -lactam compound of the formula Ä1Ü; <CHEM> wherein R<1> is a lower alkyl, a lower alkyl substituted by a hydroxy; R<2> is a hydrogen, a lower alkyl; X is O, S, NH; m and n are 0 to 4, Y<1> is a halogen, cyano, a hydroxy, an amino, a lower alkyloxy, a lower alkylamino, a carboxy, a carbamoyl, a lower alkyl, etc., Y<2> is hydrogen, an alkyl, cyano, -C(R<3>)=NR<4> (wherein R<3> and R<4> are hydrogen, an amino, an alkyl, etc., or R<3> and R<4> may combine each other together with the nitrogen atom to form a 5- to 7-membered heterocyclic group), or a pharmaceutically acceptable salt thereof, or a non-toxic ester thereof, which has an excellent antibacterial activity against Gram-positive bacteria, especially against MRSA and MRCNS. |
