| abstract |
Disclosed is a compound represented by the general formula (1) below or a pharmaceutically acceptable salt thereof. Also disclosed are a process for producing such a compound or a pharmaceutically acceptable salt thereof, and a pharmaceutical composition and antibacterial agent containing such a compound or a pharmaceutically acceptable salt thereof. (1) [In the formula, R1 represents a hydrogen atom or a C2-6 linear alkylcarbonyl group; R2 represents a hydrogen atom or a C2-6 alkylcarbonyl group; R3 represents a C1-6 alkyl group which may be substituted by a hydroxyl group or the like; R4 represents a hydrogen atom, a C1-6 alkyl group, a C2-6 alkenyl group, an Ar-B- group (wherein Ar represents an aryl group or a heterocyclic group, and B represents a C1-6 alkyl group or a C2-6 alkenyl group) or the like; and R5 and R6 independently represent a hydrogen atom, a C1-6 alkyl group which may be substituted by a hydroxyl group, or a C2-6 alkenyl group.] |