A compound of the formula (I) or its salt and a process for producing the compounds. The compounds have the effect of dilating neophrovascular tracts; ##STR1## wherein ##STR2## represents the formula ##STR3## wherein R.sup.4 is a hydrogen atom or lower alkylsulfonyl; R.sup.1 is hydrogen, lower alkyl, hydroxyl, halogen, amino, or lower acylamino; R.sup.2 is hydrogen, lower alkyl, hydroxyl, amino, or lower alkylsulfonylamino; R.sup.3 is hydrogen, lower alkyl, or hydroxyl; R is hydrogen or halogen; with the proviso that when R.sup.1 is hydroxyl, there is no case that all of R.sup.2, R.sup.3 and R are hydrogens, and further with the proviso that when R is hydrogen, A excludes ##STR4## or a salt thereof.
化合物的公式(I)或其盐以及制备该化合物的方法。这些化合物具有扩张新生血管的作用;其中##
STR2##表示公式##
STR3##,其中R.sup.4是
氢原子或低烷基磺酰基;R.sup.1是
氢、低烷基、羟基、卤素、
氨基或低酰基
氨基;R.sup.2是
氢、低烷基、羟基、
氨基或低烷基磺酰
氨基;R.sup.3是
氢、低烷基或羟基;R是
氢或卤素;但是当R.sup.1为羟基时,不存在所有的R.sup.2、R.sup.3和R都是
氢的情况,另外还有一个前提是当R是
氢时,A不包括##
STR4##或其盐。