• CAS:100517-56-4

  Pyridine, 4,​4'-​[1,​2-​ethanediylbis(thio)​]​bis-

• CAS:1227-49-2

  3,3'-dithiobis-Benzoicacid

• CAS:95195-42-9

  Ethanedione, di-4-pyridinyl-

• CAS:55778-02-4

  N1,N4-Di-2-Pyridinyl-1,4-Benzenedimethanamine

• CAS:517863-55-7

  (N1E,N4E)-N1,N4-bis(pyridin-4-ylmethylene)benzene-1,4-diamine

• CAS:770706-82-6

• CAS:58816-01-6

  P-4-pyridinyl-Phosphonic acid

• CAS:67892-43-7

  3-sulphophthalic acid

• CAS:1537175-69-1

  2-(Diphenylphosphino)terephthalic acid

• CAS:223519-93-5

  1,​4-​Benzenedicarboxylic acid, 2,​5-​diphosphono-