13,27,29,31-Tetramethyl-3,10,17,24-tetraoxa-5,6,7,8,19,20,21,22-octathia-1,12,15,26-tetraazatricyclo[24.2.2.2~12,15~]dotriacontane-4,9,18,23-tetrathione AIDS-124148 AIDS124148 NSC14538