ZnAF-2 1MG. ZnAF-2, A fluorescent Zinc probe, CAS Number: 321859-11-4, Molecular Formula: C34H28N4O5, Molecular Weight: 572. 61, Purity: greater than or equal to 95% by HPCE, Appearance: Crystalline solid, Synonym: 6-{2-[Bis(2-pyridylmethyl)amino]ethylamino}fluorescein, Size: 1MG