(Diethylamino)[6-(12-{6-[(diethylamino)thioxomethylthio]-5-nitropyrimidin-4-yl}-3,6,9,12-tetraazadispiro[5.2.5.2]hexadec-3-yl)-5-nitropyrimidin-4-ylthio]methane-1-thione AIDS-122554 AIDS122554