The compounds of the formula ##STR1## in which R is hydrogen, halogen, alkyl, alkoxy, hydroxyl, nitro or cyano; and R.sup.2 is .dbd.O, .dbd.S, H.sub.2, --SCH.sub.3, or an amino group; with the proviso that when R is chloro in 8-position, R.sup.2 must be other than oxygen or sulfur; or a pharmaceutically acceptable salt thereof.
式子为##STR1##的化合物,其中R为氢、卤素、烷基、烷氧基、羟基、硝基或
氰基;R.sup.2为.dbd.O、.dbd.S、H.sub.2、--SCH.sub.3或
氨基;但当R在8位为
氯时,R.sup.2必须是氧或
硫以外的其他官能团;或其药学上可接受的盐。