CAS 55-22-1 appears in our catalog under these names: Nicotinic Acid EP Impurity E, Nicotinic Acid EP Impurity E (Isoniazid EP Impurity A), Isonicotinic Acid, >95% (HPLC), Isonicotinic acid, Isonicotinic acid/ 99.68% (existing batch purity). Offered by: Chemat Brand, TRC, Dr. Ehrenstorfer, Mikromol, TargetMol. Available pack sizes: on request, 100g, 50g, 5g, 1g, 25mg, 100mg, 500mg.