| http://www.w3.org/ns/prov#value | - VII can be resolved subsequently into its pure enantiomers by a chiral resolution to give compounds IX and X. Alternatively, VIII can be derivatised appropriately to give XI which can be separated by chiral chromatography and then subject to cleavage to give IX and X. These compounds can then be derivatised, for example, by alkylation, to give compounds XII and XIII, where R1 is a C1 to C6 alkyl.
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