#pentoxifylline__Trental  a drug (trade name Trental) used to treat claudication; believed to increase the flexibility of red blood cells so they can flow through the blood vessels to the legs and feet
  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:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
              supertype:  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

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