2,2'-{(2,5-Dihydroxy-1,4-phenylene)bis[carbonyl(1E)hydrazin-2-yl-1-ylidene(E)methylylidene-4,1-phenylene]}bis(1-methylimidazo[1,2-a]pyridin-1-ium) dibromide AIDS-014217 AIDS014217 NSC610896