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| - The hydro-active substance 60 may be a water-soluble salt like magnesium sulfate, magnesium chloride, potassium sulfate, sodium chloride, sorbitol, inositol, urea, or a saccharide such as glucose or fructose or dextran, or, a hydrophilic polymer such as a poly(hydroxyalkyl methacrylate) with a molecular weight of 30,000 to 5,000,000, or a poly(vinylpyrrolidone) with a molecular weight of 10,000 to
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