| http://www.w3.org/ns/prov#value | - wherein R1 is a hydrogen atom, C1-C5 acyl group, benzoyl group or R2???COOR3 group, Y is a hydrogen atom or an alkali metal ion, R2 is a C1-C4 straight or branched alkylidene group and R3 is a hydrogen atom, C1-C4 alkyl group or alkali metal ion, including a stereoisomer or diasteromer thereof, or a pharmaceutically acceptable salt, or solvate thereof which comprises the steps of:
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