1,3,7,9-Tetramethyldipyrimido[4,5-b:4,5-f][1,5]diazocine-2,4,8,10(1H,3H,7H,9H)-tetrone AIDS-136705 AIDS136705 NSC639020 {Dipyrimido[4,5-b:4',5'-f][1,5]diazocine-2,4,8,10-tetrone,} 1,2,3,4, 7,8,9,10-octahydro-1,3,7,9-tetramethyl-