A compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, R.sup.2 is a hydrogen atom or a lower alkyl group, each of R.sup.3, R.sup.4 and R.sup.5 is a hydrogen atom or a lower alkyl group, or R.sup.3 and R.sup.4 together form a methylene group, an ethylene group or a propylene group, or R.sup.4 and R.sup.5 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.
该化合物的
化学式为:##STR1## 其中R.sup.1是氢原子或甲基基团,R.sup.2是氢原子或较低的烷基基团,R.sup.3、R.sup.4和R.sup.5中的每一个是氢原子或较低的烷基基团,或者R.sup.3和R.sup.4一起形成亚甲基基团、
乙烯基团或
丙烯基团,或者R.sup.4和R.sup.5与相邻的氮原子一起形成环氮丙基团、环氮乙基团、
吡咯啶基团、
哌啶基团、
哌嗪基团或吗啉基团;或其药用可接受的盐或酯。