7,7'(8H,8'H)-Spirobi[6H-dibenzo[b,j][1,12,5,8]dioxadiazacyclopentadecine], 2,2',12,12'-tetrakis(1,1-dimethylethyl)-14,14',15,15',16,16',17,17',18,18',19,19'-dodecahydro- AIDS-150919 AIDS150919 NSC689449