CAS 33420-37-0 appears in our catalog under these names: Pyrazine-2,3,5,6-tetracarbonitrile 95%, Pyrazine-2,3,5,6-tetracarbonitrile, 95%, 95%, Pyrazine-2,3,5,6-tetracarbonitrile, 95%. Offered by: Ambeed, Chemat, Fluorochem. Available pack sizes: 50mg, 100mg, 250mg, 1g.