A compound of the formula:
wherein R1 is a hydrogen atom or a methyl group, R2 is a hydrogen atom or a lower alkyl group, each of R3, R4 and R5 is a hydrogen atom or a lower alkyl group, or R3 and R4 together form a methylene group, an ethylene group or a propylene group, or R4 and R5 form together with the adjacent nitrogen atom an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidino group, a piperazinyl group or a morpholino group; or a pharmaceutically acceptable salt or ester thereof.
式的化合物:
其中 R1 是氢原子或甲基,R2 是氢原子或低级烷基,R3、R4 和 R5 各为氢原子或低级烷基,或 R3 和 R4 共同形成亚甲基、
乙烯基或
丙烯基,或 R4 和 R5 与相邻的氮原子共同形成
氮丙啶基、氮杂
环丁烷基、
吡咯烷基、
哌啶基、
哌嗪基或吗啉基;或其药用盐或酯。