| abstract |
Cephem compounds having an antibacterial activity and represented by general formula (I) or salts thereof, wherein R1 represents a group represented by any of formulae (a), (b), and (c) and (wherein R?5, R7, and R8¿ each represents amino or a protected amino group and R6 represents halogeno); R2 represents hydrogen or lower alkyl; R3 represents a heterocyclic group, (lower) alkyl substituted by heterocycle, (lower) aminoalkyl, (lower) alkyl substituted by N-substituted amino, (lower) alkyl substituted by N,N-di-substituted amino, or a group represented by general formula (d); and R4 represents carboxy or a protected carboxy group. |