#butyl_nitrite__butylnitrite__isobutyl_nitrite  a colorless pungent liquid sometimes used as a stimulant drug by drug abusers
  supertype:  #vasodilator__vasodilative  a drug that causes dilation of blood vessels
     supertype:  #dilator  a drug that causes dilation
        supertype:  #drug  a substance that is used as a medicine or narcotic
           supertype:  #agent.causal_agent  a substance that exerts some force or effect
              supertype:  #causal_agent__cause__causal_agency  any entity that causes events to happen
                 supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                    supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
  supertype:  #stimulant_drug__stimulantdrug__stimulant  a drug that temporarily quickens some vital process
     supertype:  #drug  a substance that is used as a medicine or narcotic

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