Di(2-pyridyl)glyoxal bis(4,4-diphenyl semicarbazone)

Di(2-pyridyl) diketone bis(4,4-diphenyl semicarbazone)

1,2-Di(2-pyridyl)-1,2-ethanedione bis(4,4-diphenyl semicarbazone)

2,2'-(1,2-Di-2-pyridyl-1,2-ethanediylidene)bis[N,N-diphenyl-1-hydrazinecarboxamide]