| 摘要 |
A compound represented by the following Formula (I) or a pharmaceutically acceptable salt thereof:whereinR1 represents a hydrogen atom or a carboxyl-protecting group,R2 represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group or a hydroxyl group,R3 represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, a lower alkylthio group, a nitro group, a cyano group, a hydroxyl group or an amino group;R4 represents a hydrogen atom, an amino-protecting group, an alkyl group or a cycloalkyl group, andR5 represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an alkylthio group, a hydroxyl group, an imino group or an amino group.
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