#chemical_irritant  a substance producing irritation
  supertype:  substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  capsaicin  colorless pungent crystalline compound derived from capsicum; source of the hotness of hot peppers of the genus Capsicum such as chili and cayenne and jalapeno
  subtype:  gingerol  derived from ginger; source of the hotness of ginger
  subtype:  piperin__piperine  derived from pepper (especially black pepper); source of the hotness of black and white pepper
  subtype:  isothiocyanate  a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations

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