| http://www.w3.org/ns/prov#value | - n- heptane, cyclohexane, benzene, toluene and the like and mixtures thereof; water and mixtures thereof; preferably the solvent is ethyl acetate, dichloromethane, chloroform, toluene, water and mixtures thereof; more preferably ethyl acetate. [0049] The base used can be any of those that are known in the art, for example sodium hydroxide, potassium hydroxide and the like, sodium carbonate, potassi
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