#butyric_acid__butyricacid__butanoic_acid  an unpleasant smelling fatty acid found especially in butter
  supertype:  #saturated_fatty_acid__saturatedfattyacid  a fatty acid whose carbon chain cannot absorb any more hydrogen atoms; found chiefly in animal fats
  subtype:  #hydroxybutyric_acid__oxybutyric_acid  hydroxy derivative of butyric acid
     subtype:  #beta-hydroxybutyric_acid  beta derivative of hydroxybutyric acid that is found in the blood and urine in some cases of impaired metabolism

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