| http://www.w3.org/ns/prov#value | - It is also possible to use, besides hydrochloric acid, other acids, such as sulfuric acid and acetic acid.In the step of recrystallization, although a mixed solvent of acetone/chloroform (50/50) is preferred as the solvent, it is also possible to use a mixed solvent of acetone/cyclohexane, acetone/n-hexane methanol/xylene or ethanol/xylene acetone/benzene.
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