| http://www.w3.org/ns/prov#value | - Salts of the free acid are easily prepared bytreatment of the free acid dissolved in an organic solvent such as ethyl acetate, acetone, chloroform, or the like with an equivalent amount of an inorganic base such as sodium bicarbonate, sodium hydroxide, calcium carbonate or the like, evaporating theorganic solvent and lyophilizing the aqueous phase.The products of this invention (I) form a wide var
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