| http://www.w3.org/ns/prov#value | - 0??? C., preferably at about 160??? C. After cooling, the product (A9) is crystallised by the addition of organic solvents or mixtures of solvents, e.g. diethylether/methanol, ethyl acetate, methylene chloride, or diethylether, preferably diethylether/methanol 9/1, or purified by chromatography.
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