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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Zinc sulfate  is the inorganic compound with the formula ZnSO4 as well as any of three hydrates. It was historically known as \"white vitriol\". All of the various forms are colorless solids.  The heptahydrate is commonly encountered.  It is on the World Health Organization's List of Essential Medicines, a list of the most important medication needed in a basic health system." ] ,
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