| http://www.w3.org/ns/prov#value | - of formula (IIA), with a compound of formula (IIB): R2-L (IIB) wherein R2 is as hereinbefore defined for a compound of formula (I) and L is a suitable leaving group, for example an alkylsulphonyloxy group such as a methanesulphonyloxy group, or a halogen atom, such as bromine.
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