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 D01 Inorganic Chemicals D007287 +
  D01.695 Phosphorus Compounds D017553 +
   D01.695.625 Phosphorus Acids D017976 +
    D01.695.625.675 Phosphoric Acids D010756 +
     D01.695.625.675.650 Phosphates D010710 +
      D01.695.625.675.650.775 Polyphosphates D011122 +
       D01.695.625.675.650.775.150 Diphosphates D011756 +
        D01.695.625.675.650.775.150.900 Technetium Tc 99m Pyrophosphate D016698 


 D01 Inorganic Chemicals D007287 +
  D01.925 Technetium Compounds D017556 +
   D01.925.925 Technetium Tc 99m Pyrophosphate D016698