| http://www.w3.org/ns/prov#value | - The compound of formula (XVI) is obtained from the crude mixture by distillation.A compound of formula (III) may be prepared by reaction of a compound of formula (IV): wherein R1 is as hereinbefore defined for a compound of formula (I), P is as hereinbefore defined for a compound of formula (III), and X is a halogen atom, for example bromine, with an alkali metal alkoxide, for example sodium metho
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