#hydroxybutyric_acid__oxybutyric_acid  hydroxy derivative of butyric acid
  supertype:  #butyric_acid__butyricacid__butanoic_acid  an unpleasant smelling fatty acid found especially in butter
  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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