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
7357-67-7
Alternate CAS Number
57616-74-7 (HCL Salt)
CAS Number
15307-86-5
Alternate CAS Number
15307-79-6 (Na salt); 15307-81-0 (K salt)