4-(2-(3,4-Bis(4-chlorophenyl)-5-cyano-6-oxo-1(6H)-pyridazinyl)ethoxy)-4-oxobutanoic acid 82232-19-7 AIDS-129707 AIDS129707 Butanedioic acid, {mono[2-[3,} 4-bis(4-chlorophenyl)-5-cyano-6-oxo-1(6H)-pyridazinyl\]ethyl\] ester NSC362453