Denatonium
Denatonium , usually available as denatonium benzoate ( under trade names such as Denatrol , BITTERANT-b , BITTER+PLUS , Bitrex or Aversion ) and as denatonium saccharide ( BITTERANT-s ) , is the most bitter chemical compound known , with bitterness thresholds of 0 . 05 ppm for the benzoate and 0 . 01 ppm for the saccharide . 
<triplet> Denatonium <subj> chemical compound <obj> instance of