| http://www.w3.org/ns/prov#value | - The remaining steps are carried out as in Flowsheet A, namely esterification to provide the ??-ketoester 5, formation of the mono-dimethylhydrazone derivative 6, and protection of the free hydroxy group of 6 with a suitable group to give 7, where P is a blocking group, for example trimethylsilyl.
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