AIDS-044121 AIDS044121 NSC641103 Propanenitrile, 3,3',3'',3'''-[(5-oxo-2,2'-diphenyl[1,1'-bi-1H-imidazole]-4,4'(5H,5'H)-diylidene)bis[(E)methylidyne(3-methyl-4,1-phenylene)nitrilo]]tetrakis-