| http://www.w3.org/ns/prov#value | - The resulting potassium salts of the Sxa-R4q or Sxa-R4z diastereomers, or combinations thereof, of the compounds of formulae (Ia) and/or (Ib) are thereafter converted to the corresponding magnesium salts by treatment with a magnesium source, such as, for example, magnesium sulfate in a lower alkyl alcohol, such as methanol.
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