tert-Butyl 5-amino-1,2,3,6-tetrahydropyrazine-1-carboxylate Dihydrochloride is a salt form of tert-Butyl 3-amino-5,6-dihydropyrazine-1(2H)-carboxylate (CAS 714192-90-2) which is from preparation of heterocyclic inhibitors of the renal outer medullary potassium channel for therapy.