2,7-di(pyridin-4-yl)benzo[lMn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone,N,N'-Di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxdiimide,N,N'-Di(4-pyridyl)-1,4,5,8-naphthalenetetracarboxdiimide,2,7-Di(4-pyridinyl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetrone,N,N-bis(4-pyridyl)-1,4,5,8-naphthalenetetracarboxydiimide,2,7-Di(pyridin-4-yl)benzo[lMn][3,8]phenanthroline-1,3,6,8(2h,7h)-tetraone, 75%, 25% in DMF,JACS-34151-49-0,Benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetrone,2,7-di-4-pyridinyl-