Patent ID: 7030115

Claim:
A compound of formula (I) or a therapeutically acceptable salt thereof, wherein A is piperazine; R 1 is nitro; R 2 is —NR 5 R 6 ; R 3 is hydrogen; R 4 is selected from the group consisting of aryl and cycloalkyl wherein the aryl group may be optionally substituted with up to 5 substituents selected from the group consisting of alkyl, nitro, halo, phenylalkoxy, morpholinocarbonylalkyl and morpholinoalkyl and the cycloalkyl group may be optionally substituted with up to 5 substituents selected from the group consisting of alkyl, alkoxy and phenylalkyl; R 5 is hydrogen and R 6 is selected from the group consisting of, arylsulfanylalkyl, arylsulfinylalkyl and arylsulfonylalkyl, the alkyl part of each of which is substituted with —NR 9 R 10 , wherein R 9 and R 10 are alkyl; and R 15 is selected from the group consisting of hydrogen, alkoxy, alkyl, and halo.