1,4-Dioxide of 7-(4'-nitrophenyl)-3-[4'-(4-nitrophenyl)-1'-piperazinyl]-2-quinoxalinacarbonitrile 1,4-dioxide of 7-(4'-nitrophenyl)-3-[4'-(4''-nitrophenyl)-1'-piperazinyl]-2-quinoxalinacarbonitrile AIDS-048229 AIDS048229