#pyridine  a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal
  supertype:  #base__alkali  any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
  subtype:  #triphosphopyridine  a pyridine ring with three phosphorus groups

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