A compound represented by the following formula (9):
wherein R5 represents an amino or protected amino group and Y represents a hydrogen atom, a lower alkyl group, a halogen atom or a nitro group, or a salt thereof.
由下式(9)代表的化合物:
其中 R5 代表
氨基或受保护的
氨基,Y 代表氢原子、低级烷基、卤素原子或硝基,或其盐。