AIDS-137970 AIDS137970 NSC643740 Propanenitrile, 3,3'-[[4-[(1Z)-1-[1-(4-bromophenyl)-2-(2-chloro-5-nitrophenyl)-1,5-dihydro-5-oxo-4H-imidazol-4-ylidene]ethyl]-3-methylphenyl]imino]bis-