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 D01 Inorganic Chemicals D007287 +
  D01.248 Electrolytes D004573 +
   D01.248.497 Ions D007477 +
    D01.248.497.158 Anions D000838 +
     D01.248.497.158.874 Sulfides D013440 +
       D01.248.497.158.874.390 Disulfides D004220 +


 D01 Inorganic Chemicals D007287 +
  D01.875 Sulfur Compounds D013457 +
   D01.875.350 Hydrogen Sulfide D006862 +
    D01.875.350.850 Sulfides D013440 +
      D01.875.350.850.150 Disulfides D004220 +


 D02 Organic Chemicals D009930 +
  D02.886 Sulfur Compounds D013457 +
   D02.886.520 Sulfides D013440 +
     D02.886.520.150 Disulfides D004220 +