| http://www.w3.org/ns/prov#value | - mpounds are obtained in racemic form, they may subsequently be resolved into the enantiomers as mentioned above. [0353] The enantiomers are preferably separated by column separation on chiral phases or by recrystallisation from an optically active solvent or by reacting with an optically active substance which forms salts or derivatives such as e.g. esters or amides with the racemic compound, part
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