4,11,18,25-Tetraisopropyl-7,14,21,28-tetramethyl-6,13,20,27-tetraoxa-3,10,17,24,29,30,31,32-octaazapentacyclo[24.2.1.1~5,8~.1~12,15~.1~19,22~]dotriaconta-5(32),12(31),19(30),26(29)-tetraene-2,9,16,23-\ttetrone AIDS-143135 AIDS143135 NSC663247