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 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 +
      D01.875.800.800.850.950 Zinc Sulfate D019287 


 D01 Inorganic Chemicals D007287 +
  D01.975 Zinc Compounds D017967 +
   D01.975.987 Zinc Sulfate D019287