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phen·tet·io·tha·lein

n :  a substance or its disodium salt C20H8I4Na2O4 isomeric with iodophthalein used esp. formerly as a radiopaque medium in cholecystography and in tests of liver function - called also phenoltetraiodophthalein  .
 
   

 
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Rangely District Hospital (Rangely, Colorado - Rio Blanco County)