denatonium

Etymology
From.

Noun

 * 1)  A quaternary ammonium cation N-benzyl-2-(2,6-dimethylanilino)-N,N-diethyl-2-oxoethan-1-aminium benzoate; the most bitter chemical compound known, whose salts are used as aversive agents to prevent accidental ingestion of dangerous substances.

Coordinate terms

 * a similar compound without a benzyl group