Aromatic compounds can be derived as cyclic compounds with alternating double and single bonds in their ring structure. Aromatic compounds consist of features like they contain at least one planar carbon ring and possess alternating double and single bonds in the carbon ring.

CAS Number
119532-26-2(HCl Salt)
Alternate CAS Number
41202-77-1(Freebase)
CAS Number
651770-09-1(free base); 1312366-79-2 (Ca salt); 131275-93-9 (Na salt)
CAS Number
169905-10-6 (base)
Alternate CAS Number
72830-09-2 (sel HCl)