1) Benzoglyoxaline 1) Simple aromatic ring 
Benzimidazole, in an extension of the well-elaborated imidazole system, has been used as carbon skeletons for N-heterocyclic carbenes. The NHCs are usually used as ligands for transition metal complexes. They are often prepared by deprotonating an N,N`-disubstituted benzimidazolium salt at the 2-position with a base. ==Preparation== Benzimidazole....
A ring system comprised of a benzene ring fused with an imidazole ring; occurs in nature as part of the vitamin B12 molecule. ... (05 Mar 2000) ... 
Type: Term Pronunciation: benz-im-id-ā′zōl Definitions: 1. A ring system composed of a benzene ring fused with an imidazole ring; occurs in nature as part of the vitamin B12 molecule. 2. A class of antihelmintic, often used to treat nematodes and cestodes.
a colorless crystalline compound, CHN, used in organic synthesis. Also called