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
298-46-4
Alternate CAS Number
70972-24-6(HCl salt)
CAS Number
151250-76-9
Alternate CAS Number
1346603-62-0(HCl salt)