| 摘要 |
A compound represented by the following general formula (1) or a pharmaceutically acceptable salt thereof, which is useful for a prophylactic and/or therapeutic treatment of a microbial infectious disease. [R<SUB>1 </SUB>is hydrogen atom, or a linear C1-6 alkylcarbonyl group; R<SUB>2 </SUB>is hydrogen atom, or a C1-6 alkylcarbonyl group; R<SUB>3 </SUB>is hydrogen atom, a C1-6 alkyl group, a C1-6 alkylcarbonyl group, a C1-6 alkenyl group, a C2-6 alkenylcarbonyl group, a C2-6 alkynyl group, or an Ar-B- group (Ar represents an aryl group, or a heterocyclic group, and B is a C1-6 alkyl group, a C1-6 alkylcarbonyl group, a C2-6 alkenyl group, a C2-6 alkenylcarbonyl group, or a C2-6 alkynyl group); R<SUB>5</SUB>, R<SUB>6</SUB>, R<SUB>7</SUB>, and R<SUB>8 </SUB>represent hydrogen atom, a C1-6 alkyl group, a C2-6 alkenyl group, a C2-6 alkynyl group, or an Ar-B'- group (B' is a C1-6 alkyl group, a C2-6 alkenyl group, or a C2-6 alkynyl group); X is oxygen atom, or an -NR<SUB>4</SUB>- group (R<SUB>4 </SUB>is hydrogen atom, a C1-6 alkyl group, or a C1-6 alkyl group which may be substituted with an Ar group); and R<SUB>4'</SUB> is hydrogen atom, or a group represented by the aforementioned formula (a) (R<SUB>3''</SUB> and R<SUB>4''</SUB> represent hydrogen atom, or a linear or branched C1-6 alkylcarbonyl group)]
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