13,16:29,32-Diethenotetrapyrimido[1,2-d:1',2'-n:2'',1''-j:2''',1'''-t][1,4,11,14]tetraazacycloeicosine, 1,2,3,4,6,7,9,10,11,12,12a,16a,17,18,19,20,22,23,25,26,27,28,28a,32a-tetracosahydro- AIDS-139737 AIDS139737 NSC649616