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 D01 Inorganic Chemicals D007287 +
  D01.103 Barium Compounds D017609 +
   D01.103.075 Barium Sulfate D001466 


 D01 Inorganic Chemicals D007287 +
  D01.875 Sulfur Compounds D013457 +
   D01.875.800 Sulfur Acids D013456 +
    D01.875.800.800 Sulfuric Acids D013464 +
     D01.875.800.800.850 Sulfates D013431 +
      D01.875.800.800.850.075 Barium Sulfate D001466