
1) Simple aromatic ring
Found on
https://www.crosswordclues.com/clue/benzoxazole

Benzoxazole is an aromatic organic compound with a molecular formula C7H5NO, a benzene-fused oxazole ring structure, and an odor similar to pyridine. Benzoxazole is used primarily in industry and research, and has no household use. Being a heterocyclic compound, benzoxazole finds use in research as a starting material for the synthesis of larger, ...
Found on
http://en.wikipedia.org/wiki/Benzoxazole
No exact match found.