Heterocyclic compound is a major class of organic chemical compounds characterized by some or all of the atoms in their molecules are joined in rings containing atleast one atom of an element other than carbon.

CAS Number
503614-92-4(base)
Alternate CAS Number
1926236-73-8(sodium Salt)
CAS Number
1008531-60-9(HCl Salt); 1428331-96-7 (hydrate) ; 2389989-55-1 (2HCl salt)
CAS Number
203395-84-0(freebase)
Alternate CAS Number
2748462-55-5(HCl salt)